{"schemaVersion":"1.0","revision":"fa961ab24277a91737c3","article":{"id":"scwiki-d10","topicId":"scwiki-topic-d10","code":"D10","slug":"organic-charge-transfer-superconductors","title":"Organic superconductors: charge-transfer salts, Mott physics and pairing probes","summary":"Compare molecular salts through pressure, cooling history, nodal transport and spin response, while separating superconducting transitions from Mott endpoints and probe conditions.","aliases":["organic superconductors","charge-transfer salts","Bechgaard salts","BEDT-TTF","ET","TMTSF","kappa-Br","kappa-Cl","kappa-NCS"],"evidenceTypes":["theory","experiment"],"relatedCodes":["B9","B14","C3","C5","D9"],"editorialStatus":"scoped-check","contentState":"pilot","modifiedAt":"2026-10-20","review":{"checkedAt":"2026-10-20","scope":"Selected Lefebvre phase/probe, Izawa angular-transport, Kagawa Mott-scaling and Shinagawa spin-response passages, plus scoped discovery metadata and prior B9 checks. Follow-up Izawa amplitude normalization/DOS interpretation and Shinagawa sample-specific field sweeps, plotted scaling and contact limitations.","limitations":["Complete scientific acceptance, final-version comparisons and raw-data reproduction remain open.","Jerome1980 original text is inaccessible here; Kini1990 is title/metadata-only; Lee2001/2002 is abstract-only.","Kagawa full methods/supplement and Papanikolaou theoretical proof remain outside this check.","Synthetic algebra does not establish a unique gap symmetry, universality class or common mechanism across molecular families."]},"provenance":{"repository":"JackZH26/jzis-superconductivity","commit":"0a7c9d6696804ec26aa12f8eed68b55c9b3c0fcf","path":"D_material_families/D10_organic.md","sha256":"753835b01f35ccd0de3ab00bf3f267a7bfe7f67991eadb0deb94f1031121045a","sourceId":"file-0985c13bcbe137f7"},"sourceMap":[{"startLine":1,"endLine":68,"targetSections":["scope","mathematical-assumptions","experimental-criteria","limits-and-disputes","discovery-implications","related-topics"],"decision":"edited-with-scoped-evidence","note":"Pinned chapter unchanged; DOI identity, publication dates, phase and probe conditions corrected."}],"references":[{"id":"source-2c57ae9e6e679429","doi":"10.1051/jphyslet:0198000410409500","title":"Superconductivity in a synthetic organic conductor (TMTSF)2PF6","year":1980,"url":"https://doi.org/10.1051/jphyslet:0198000410409500","publicationStatus":"journal-article","verification":{"scope":"bibliographic-identity-only","checkedAt":"2026-10-18","evidenceUrl":"https://doi.org/10.1051/jphyslet:0198000410409500","note":"Crossref original identity checked. Original PDF403 and HAL anti-bot page; experimental methods and discovery temperature not independently reviewed here."}},{"id":"source-c3edeba243e544d9","doi":"10.1021/ic00339a004","title":"A new ambient-pressure organic superconductor, κ-(ET)2Cu[N(CN)2]Br, with the highest transition temperature yet observed (inductive onset Tc = 11.6 K, resistive onset = 12.5 K)","year":1990,"url":"https://doi.org/10.1021/ic00339a004","publicationStatus":"journal-article","verification":{"scope":"publisher-title-and-issue-metadata","checkedAt":"2026-10-18","evidenceUrl":"https://pubs.acs.org/doi/abs/10.1021/ic00339a004","note":"Original1July1990, Inorganic Chemistry29,2555–2557; online1May2002 is digitization. Title preserves distinct inductive and resistive criteria. Full methods unavailable. Incorrect pinned ic00331a012 separately verified through Crossref as an unrelated metal-complex structural analysis."}},{"id":"source-2cc5358d54a65217","doi":"10.1103/PhysRevLett.85.5420","title":"Mott transition, antiferromagnetism, and unconventional superconductivity in layered organic superconductors","year":2000,"url":"https://doi.org/10.1103/PhysRevLett.85.5420","publicationStatus":"journal-article","verification":{"scope":"selected-author-phase-diagram-and-probe-conditions","checkedAt":"2026-10-18","evidenceUrl":"https://arxiv.org/pdf/cond-mat/0004455v1","note":"Authorv1 submitted26April2000; journal18December2000. Selected pp1–2 read for helium sweeps, simultaneous NMR versus susceptibility conditions and inhomogeneous coexistence. Final-version comparison and raw phase-fraction analysis pending."}},{"id":"source-09e9a4299e3fd1d3","doi":"10.1038/nature03806","title":"Unconventional critical behaviour in a quasi-two-dimensional organic conductor","year":2005,"url":"https://doi.org/10.1038/nature03806","publicationStatus":"journal-article","verification":{"scope":"selected-author-transport-and-scaling-passages","checkedAt":"2026-10-18","evidenceUrl":"https://arxiv.org/pdf/cond-mat/0603064v1","note":"Journal28July2005; author upload3March2006. Selected pp1–3 and5 read: four-probe helium-pressure conductance,39.7K24.8MPa Mott endpoint, exponents, excluded closest region and order-parameter/scaling assumptions. Full methods, supplement and raw fits not reviewed."}},{"id":"source-9fb11dd7e1fcdc76","doi":"10.1103/PhysRevLett.88.027002","title":"Superconducting Gap Structure of κ-(BEDT-TTF)2Cu(NCS)2 Probed by Thermal Conductivity Tensor","year":2002,"url":"https://doi.org/10.1103/PhysRevLett.88.027002","publicationStatus":"journal-article","verification":{"scope":"selected-author-amplitude-normalization-and-nodal-interpretation","checkedAt":"2026-10-20","evidenceUrl":"https://arxiv.org/pdf/cond-mat/0107537v2","note":"Authorv2 dated9November2001. Re-read selected pp2–4; p3Figs3–4 visually inspected.2T,0.72/0.52/0.43K,C4/kappa_n<0.1%/about0.2%/about0.2%; amplitude not peak-to-peak or electronic-only normalization. Fieldcooling/rotation reversal, DOS-vs-scattering regime and b/c-axis maxima retained. Full final comparison/raw refit pending. Reported10.4K Tc appears in abstract without onset criterion; simultaneous resistivity is described as alignment verification, so previous resistive label withdrawn."}},{"id":"source-e055004651dafe18","doi":"10.1103/PhysRevLett.88.017004","title":"Triplet Superconductivity in an Organic Superconductor Probed by NMR Knight Shift","year":2002,"url":"https://doi.org/10.1103/PhysRevLett.88.017004","publicationStatus":"journal-article","verification":{"scope":"publisher-abstract-only","checkedAt":"2026-10-18","evidenceUrl":"https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.88.017004","note":"Published19December2001,2002issue. PF6 at7kbar with fieldalong a: unchanged shift and triplet interpretation. Full methods not reviewed; earlier cond-mat/0001332 author list differs and equivalence was not established."}},{"id":"source-9d15cd9236072f5c","doi":"10.1103/PhysRevLett.91.107001","title":"Spin Liquid State in an Organic Mott Insulator with a Triangular Lattice","year":2003,"url":"https://doi.org/10.1103/PhysRevLett.91.107001","publicationStatus":"journal-article","verification":{"scope":"publisher-abstract-scoped-check","checkedAt":"2026-10-18","evidenceUrl":"https://link.aps.org/doi/10.1103/PhysRevLett.91.107001","note":"Reused B9 scoped review with unchanged access/version limits. Abstract: NMR absence of order down to32mK and susceptibility exchange scale about250K. Neither is Tc; full methods not reviewed."}},{"id":"source-0443485ac20d3a8c","doi":"10.1103/PhysRevLett.95.177001","title":"Mott Transition from a Spin Liquid to a Fermi Liquid in the Spin-Frustrated Organic Conductor kappa-(ET)2Cu2(CN)3","year":2005,"url":"https://doi.org/10.1103/PhysRevLett.95.177001","publicationStatus":"journal-article","verification":{"scope":"publisher-abstract-scoped-check","checkedAt":"2026-10-18","evidenceUrl":"https://link.aps.org/doi/10.1103/PhysRevLett.95.177001","note":"Reused B9 scoped review with unchanged access/version limits. Pressure NMR/resistivity phase diagram and neighboring superconductivity; no causal RVB mechanism established. Full data not reviewed."}},{"id":"source-39706a37d6f5ce86","doi":"10.1146/annurev-conmatphys-062910-140521","title":"Mott Physics in Organic Conductors with Triangular Lattices","year":2011,"url":"https://doi.org/10.1146/annurev-conmatphys-062910-140521","publicationStatus":"journal-article","verification":{"scope":"publisher-review-abstract-and-metadata","checkedAt":"2026-10-18","evidenceUrl":"https://www.annualreviews.org/content/journals/10.1146/annurev-conmatphys-062910-140521","note":"Advance12January2011,volume2,167–188,March2011. Abstract overview of triangular organic Mott systems checked; full review and material-specific hopping parameters not reviewed."}},{"id":"source-c08f058f3170fafa","doi":"10.1103/PhysRevLett.98.147002","title":"Superconducting State of the Organic Conductor (TMTSF)2ClO4","year":2007,"url":"https://doi.org/10.1103/PhysRevLett.98.147002","publicationStatus":"journal-article","verification":{"scope":"selected-author-sample-field-and-scaled-relaxation-figure","checkedAt":"2026-10-20","evidenceUrl":"https://arxiv.org/pdf/cond-mat/0701566v2","note":"Authorv2 dated3April2007 verified on arXiv; generated2018 date is not publication. Selected pp2–4/Figs1–3 read; pp2–3 figure pixels inspected. SampleA near a,B near b-prime; low-tip heating checks, B screening bound,100mK crossover and a-only transport separated. Fig3 axis(T1T)^-1 with a-direction multiplied6 despite terse caption sayingT1^-1.40kOe unchanged shifts do not uniquely identify high-field pairing. No final-version comparison/raw fit."}},{"id":"source-5e0dcd80e8b64a1b","doi":"10.1038/s41467-023-37491-z","title":"Chasing the spin gap through the phase diagram of a frustrated Mott insulator","year":2023,"url":"https://doi.org/10.1038/s41467-023-37491-z","publicationStatus":"journal-article","verification":{"scope":"published-primary-passages-scoped-check","checkedAt":"2026-10-18","evidenceUrl":"https://www.nature.com/articles/s41467-023-37491-z.pdf","note":"Reused B9 scoped review with unchanged access/version limits. Published pp.1–5 selected results,discussion,methods and data analysis; Fig4/discussion visually checked. Substrate strain and inferred hydrostatic-equivalent pressure, VBS interpretation with gapped chiral QSL not excluded, mounting microcracks retained. Raw-data audit pending."}},{"id":"source-8e919dde44063203","doi":"10.1103/PhysRevLett.100.026408","title":"Universality of Liquid-Gas Mott Transitions at Finite Temperatures","year":2008,"url":"https://doi.org/10.1103/PhysRevLett.100.026408","publicationStatus":"journal-article","verification":{"scope":"publisher-theory-abstract-only","checkedAt":"2026-10-18","evidenceUrl":"https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.100.026408","note":"Published18January2008. Abstract distinguishes Ising thermodynamic order from conductivity coupling, disorder and dimensional crossover. Full theoretical proof not reviewed; not a unique resolution for all organic systems."}}],"claims":[{"id":"scwiki-d10-claim-scope-1","sectionId":"scope","statement":"Organic charge-transfer salts provide distinct low-dimensional settings for superconductivity. The Bechgaard salts (TMTSF)₂X have strongly anisotropic electronic motion; the κ-(BEDT-TTF)₂X family has conducting molecular layers and is widely studied near a pressure-controlled Mott transition. The anion, molecular packing, sample history and field direction are part of the material identity. A pairing assignment for one salt or field regime is not a classification of the entire family.","evidenceType":"experiment","sourceIds":["source-2cc5358d54a65217","source-39706a37d6f5ce86","source-c08f058f3170fafa"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-scope-2","sectionId":"scope","statement":"The 1980 Jérome report identifies superconductivity in (TMTSF)₂PF₆. Its bibliographic identity is checked here, while the original experimental text remains an access gap. For κ-Br, the 1990 Kini paper explicitly distinguishes an inductive onset of 11.6 K from a resistive onset of 12.5 K in its title. Those criteria should survive quotation and database export. Its original publication is July 1990; the publisher's 2002 online date does not move the discovery into a later decade.","evidenceType":"experiment","sourceIds":["source-2c57ae9e6e679429","source-c3edeba243e544d9"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-mathematical-assumptions-1","sectionId":"mathematical-assumptions","statement":"Izawa's rotating-field thermal-conductivity analysis separates $\\kappa(\\theta)=C_0+C_2\\cos(2\\theta)+C_4\\cos(4\\theta)$, where the angle is between the heat current and the in-plane field. The large twofold term has a substantial phonon-scattering contribution, whereas the low-temperature fourfold term is interpreted through nodal quasiparticles. An independent synthetic harmonic-recovery check confirms the decomposition algebra, not the original fit or the inferred gap symmetry. A 45° rotation reverses the sign of the fourfold basis function, so node labels require a stated crystallographic convention.","evidenceType":"theory","sourceIds":["source-9fb11dd7e1fcdc76"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-mathematical-assumptions-2","sectionId":"mathematical-assumptions","statement":"The normal-state anisotropic shift used by Shinagawa is $K=K_{\\mathrm{iso}}+K_{\\mathrm{ax}}(3\\cos^2\\theta-1)$, with $K_{\\mathrm{iso}}=3.9\\times10^{-4}$ and $K_{\\mathrm{ax}}=10.5\\times10^{-4}$. Substitution gives 2,490 ppm at 0° and −660 ppm at 90°. These are signed model contributions, not directly the observed superconducting change. Reducing the spin contribution can move resonance shifts in opposite directions for two orientations. Hyperfine calibration, chemical shifts, screening fields and pulse heating must therefore accompany a spin-pairing inference.","evidenceType":"theory","sourceIds":["source-c08f058f3170fafa"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-mathematical-assumptions-3","sectionId":"mathematical-assumptions","statement":"Kagawa's transport analysis found approximate exponents $(\\delta,\\beta,\\gamma)=(2,1,1)$, satisfying $\\delta=1+\\gamma/\\beta$. Checking that identity does not independently validate a universality class. The analysis maps conductance onto an order parameter and treats pressure/temperature mixing within stated approximations; it excludes the closest region to the endpoint because of calibration and sample limitations. A later theoretical treatment shows how conductivity can couple to singular quantities other than the thermodynamic order parameter. Transport exponents and thermodynamic exponents must not be equated automatically.","evidenceType":"theory","sourceIds":["source-09e9a4299e3fd1d3","source-8e919dde44063203"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-experimental-criteria-1","sectionId":"experimental-criteria","statement":"Lefebvre's κ-Cl phase diagram combines proton NMR with AC susceptibility under helium-gas pressure. NMR uses a 0.5 T field perpendicular to the layers; susceptibility uses an approximately 0.05 Oe oscillating field parallel to them, without a static field. Slow pressure and temperature sweeps, restricted to helium's fluid region, resolve hysteresis and changing phase fractions. The reported meeting region near 282 bar and 13.1 K is not evidence that antiferromagnetism and superconductivity occupy every microscopic volume together: the paper explicitly discusses inhomogeneous coexistence.","evidenceType":"experiment","sourceIds":["source-2cc5358d54a65217"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-experimental-criteria-2","sectionId":"experimental-criteria","statement":"In the separate κ-Cl conductance experiment, a critical endpoint occurs near 39.7 ± 0.1 K and 24.8 ± 0.1 MPa. Here the paper's symbol Tc denotes the Mott endpoint, not a superconducting transition. Four-probe measurements, helium pressure sweeps near 3 MPa per hour and a current-independence check over two orders of magnitude underpin this assignment. The endpoint pressure is 0.0248 GPa; confusing MPa with GPa would introduce a factor of one thousand.","evidenceType":"experiment","sourceIds":["source-09e9a4299e3fd1d3"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-experimental-criteria-3","sectionId":"experimental-criteria","statement":"Izawa studies κ-(BEDT-TTF)₂Cu(NCS)₂ with a reported transition near 10.4 K. The accessed manuscript does not specify an onset criterion for that value; its resistivity check establishes field alignment, not a separately documented resistive Tc. Heat flows along b; the field rotates in the bc plane with alignment better than 0.01°. The sample is field-cooled with the field along b, and reversing the rotation produced no observed hysteresis. Figures 3–4 separate the constant and twofold terms before reporting the fourfold component at 2 T:\n\n| Probe temperature | Fourfold amplitude relative to normal-state total conductivity |\n|---|---|\n| 0.72 K | Less than 0.1% |\n| 0.52 K | Approximately 0.2% |\n| 0.43 K | Approximately 0.2% |\n\nHere the quoted fraction is $|C_4|/\\kappa_n$, not a peak-to-peak span and not a fraction of electronic conductivity alone. A pure cosine with 0.2% amplitude has a 0.4% peak-to-peak span; this is arithmetic from the stated harmonic, not a refit. These temperatures are measurement conditions, not additional Tc values. In the authors' low-temperature density-of-states interpretation, fourfold maxima for fields along b and c imply nodes rotated 45° from those axes. Competing vortex-scattering effects can change the transport interpretation with temperature and field; a symmetry label without that regime and coordinate convention is insufficient.","evidenceType":"experiment","sourceIds":["source-9fb11dd7e1fcdc76"],"conditions":"Izawa author-v2,2T bc-plane rotation, heat current b, field-cooled along b; C4/kappa_n amplitude versus peak-to-peak span and electronic normalization separated. Reported10.4K Tc has unspecified onset criterion in the accessed version.","verificationScope":"Selected original author-v2 passages and figure pixels checked; no raw-data refit or complete final-version comparison.","sourceRelationship":"mixed-source-and-local-derivation","derivationNote":"Izawa author-v2 Figs3–4 report the fourfold coefficient relative to total normal-state conductivity. Doubling a pure cosine amplitude to obtain its peak-to-peak span is local arithmetic; nodal directions retain the authors' DOS-regime interpretation and crystallographic convention, not an independent fit."},{"id":"scwiki-d10-claim-experimental-criteria-4","sectionId":"experimental-criteria","statement":"For (TMTSF)₂ClO₄, Shinagawa's samples were cooled at 7 mK per minute through anion ordering near 24 K and showed resistive/rf onset near 1.4 K. Sample A was aligned near a, while sample B was aligned near b′. NMR pulses with tip angles below 3° were checked for heating by time-synchronous resistance measurements. Around 9.6 kOe, the resonance shifts move in opposite directions for these orientations, consistently with reduced spin susceptibility and anisotropic hyperfine coupling. The screening-field estimate below 100 ppm was obtained for sample B; it is not a universal correction for both samples.\n\nAt 100 mK, the relaxation crossover near 15 kOe lies within the superconducting regime. Figure 3 plots $(T_1T)^{-1}$ and multiplies the a-direction data by six: apparent overlap of the plotted curves does not mean equal unscaled rates. The accompanying interlayer resistance is for sample A with field along a; a missing contact prevented the corresponding reliable sample-B measurement. Resistance remains undetectable up to about 30 kOe in sample A, so the approximately 15 kOe crossover must not be substituted for its upper critical field. At 40 kOe the Knight shift shows no detectable change from the normal-state value down to 100 mK. Neither that observation nor the crossover uniquely identifies an FFLO or triplet state; the paper leaves the high-field state unresolved. Probe temperatures and anion ordering remain separate from superconducting Tc.","evidenceType":"experiment","sourceIds":["source-c08f058f3170fafa"],"conditions":"Shinagawa author-v2: sampleA near a/sampleB near b-prime;9.6kOe shifts,100mK field sweep,Fig3 plots(T1T)^-1 with a-direction multiplied by6; missing B transport contact;40kOe shift condition.","verificationScope":"Selected original author-v2 passages and figure pixels checked; no raw-data refit or complete final-version comparison.","sourceRelationship":"mixed-source-and-local-derivation","derivationNote":"Shinagawa author-v2 Figs1–3 and text support sample/orientation-specific shifts, heating checks, plotted-rate scaling and a crossover within superconductivity. Keeping the crossover distinct from Hc2 and the temperatures distinct from Tc is editorial synthesis, not a new high-field phase identification."},{"id":"scwiki-d10-claim-limits-and-disputes-1","sectionId":"limits-and-disputes","statement":"The earlier Lee result concerns a different salt, (TMTSF)₂PF₆, at 7 kbar with field along the conducting a axis; its abstract reports little Knight-shift change and argues for triplet pairing. The later ClO₄ study finds a low-field singlet-compatible response and leaves its high-field state unresolved. These are condition-specific observations. High upper critical fields, unchanged shifts in one regime or proximity to spin-density-wave order cannot alone establish family-wide p-wave superconductivity.","evidenceType":"experiment","sourceIds":["source-e055004651dafe18","source-c08f058f3170fafa"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-limits-and-disputes-2","sectionId":"limits-and-disputes","statement":"For κ-(BEDT-TTF)₂Cu₂(CN)₃, absence of magnetic ordering down to 32 mK motivated a spin-liquid interpretation, while pressure studies found a neighboring superconducting region. Subsequent spin-gap work supports a valence-bond interpretation but does not uniquely exclude a gapped chiral spin liquid. Mounting strain and microcracks complicate comparison with a nominally hydrostatic experiment. Neither an exchange scale nor a spin-gap anomaly should become a superconducting Tc record.","evidenceType":"experiment","sourceIds":["source-9d15cd9236072f5c","source-0443485ac20d3a8c","source-5e0dcd80e8b64a1b"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-limits-and-disputes-3","sectionId":"limits-and-disputes","statement":"The original κ-Br reference in the pinned draft had an unrelated DOI. The correct identifier is 10.1021/ic00339a004; 10.1021/ic00331a012 identifies a metal-complex structural-analysis paper. This public article corrects the citation while preserving the fixed source file. Discovery-era methods, complete supplements, final-version comparisons and original-data refits remain outside parts of this scoped review.","evidenceType":"experiment","sourceIds":["source-c3edeba243e544d9"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-discovery-implications-1","sectionId":"discovery-implications","statement":"Compare pressure, chemical substitution and strain through measured phase diagrams rather than treating them as interchangeable tuning knobs. Report the exact salt, cooling protocol, pressure medium, field orientation and transition criterion before comparing performance. A useful next measurement should distinguish competing explanations—for example by combining bulk thermodynamics, low-heating spin probes and controlled-disorder studies on the same specimen. A nearby Mott state constrains a mechanism without identifying it uniquely.","evidenceType":"theory","sourceIds":["source-2cc5358d54a65217","source-09e9a4299e3fd1d3","source-c08f058f3170fafa"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."},{"id":"scwiki-d10-claim-discovery-implications-2","sectionId":"discovery-implications","statement":"Molecular superconductors also provide a warning against copying symmetry names between coordinate systems. The κ-NCS thermal-conductivity paper discusses nodal directions relative to b and c as well as a rotated convention. Preserve those directions and the observable itself when comparing with theories. Fullerides belong to a separate molecular family with different orbital degeneracy and vibronic physics; the shared word “organic” does not make their pairing evidence interchangeable.","evidenceType":"theory","sourceIds":["source-9fb11dd7e1fcdc76","source-39706a37d6f5ce86"],"conditions":"Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.","verificationScope":"Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open."}],"corrections":[{"id":"scwiki-d10-kini-doi","description":"Corrected unrelated pinned ic00331a012 to original organic-superconductor discovery ic00339a004.","sourceId":"source-c3edeba243e544d9","scope":"Public article and machine exports; pinned source preserved."},{"id":"scwiki-d10-correction-angular-amplitude-and-field-regimes","description":"Clarified C4 amplitude normalization and local peak-to-peak arithmetic; retained sample-specific low-field shifts, sixfold plot scaling, missing transport contact and crossover distinct from Hc2. Added probe-temperature records without experimental Tc. Removed the unsupported resistive label from Izawa10.4K: the manuscript abstract gives Tc without an onset criterion, while simultaneous resistance is described as an alignment check.","scope":"D10 body, claims and exported material records; pinned source files unchanged."}],"equationChecks":[{"targetSectionId":"mathematical-assumptions","tex":"\\kappa=C_0+C_2\\cos2\\theta+C_4\\cos4\\theta","check":"Four synthetic harmonic recovery cases and720-point45degree basis-sign rotation."},{"targetSectionId":"mathematical-assumptions","tex":"K=K_{iso}+K_{ax}(3\\cos^2\\theta-1)","check":"Three normal-shift substitutions, not superconducting shift measurements."},{"targetSectionId":"mathematical-assumptions","tex":"\\delta=1+\\gamma/\\beta","check":"Identity substitution only, not universality validation."}],"materialCases":[{"id":"scwiki-d10-material-1","formula":"κ-(ET)2Cu[N(CN)2]Br","sample":"Kini κ-Br original title","recordType":"experiment","reportedTemperatureK":11.6,"tcK":11.6,"temperatureKind":"transition","temperatureNote":"Different criterion from12.5K resistive onset; full methods not reviewed.","criterion":"inductive-onset","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"Inductive response; original title only","sourceId":"source-c3edeba243e544d9","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-2","formula":"κ-(ET)2Cu[N(CN)2]Br","sample":"Kini κ-Br original title","recordType":"experiment","reportedTemperatureK":12.5,"tcK":12.5,"temperatureKind":"transition","temperatureNote":"Same discovery report as11.6K inductive onset; not a later2002 discovery.","criterion":"resistive-onset","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"Electrical resistance; original title only","sourceId":"source-c3edeba243e544d9","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-3","formula":"κ-(BEDT-TTF)2Cu[N(CN)2]Cl","sample":"Kagawa Mott endpoint","recordType":"experiment","reportedTemperatureK":39.7,"tcK":null,"temperatureKind":"normal-state","temperatureNote":"39.7±0.1K and24.8±0.1MPa; not a superconducting transition.","criterion":"mott-critical-endpoint","pressureRegime":"high","pressureGPa":{"min":0.0248,"max":0.0248},"equilibrium":"equilibrium","probe":"Four-probe DC conductance under helium pressure","sourceId":"source-09e9a4299e3fd1d3","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-4","formula":"κ-(BEDT-TTF)2Cu[N(CN)2]Cl","sample":"Lefebvre phase-meeting region","recordType":"experiment","reportedTemperatureK":13.1,"tcK":null,"temperatureKind":"measurement","temperatureNote":"Meeting of phase boundaries; inhomogeneous coexistence, not a homogeneous SC/AF proof.","criterion":"phase-diagram-meeting-region","pressureRegime":"high","pressureGPa":{"min":0.0282,"max":0.0282},"equilibrium":"equilibrium","probe":"NMR0.5T perpendicular; AC0.05Oe parallel without static field","sourceId":"source-2cc5358d54a65217","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-5","formula":"κ-(BEDT-TTF)2Cu(NCS)2","sample":"Izawa thermal-transport crystal","recordType":"experiment","reportedTemperatureK":10.4,"tcK":10.4,"temperatureKind":"transition","temperatureNote":"10.4K reported Tc; onset/zero/bulk criterion not independently established in the accessed manuscript. Simultaneous resistivity checks field alignment and does not establish this Tc criterion.","criterion":"reported-transition-unspecified","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"Reported Tc in manuscript abstract; transition criterion not specified","sourceId":"source-9fb11dd7e1fcdc76","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-6","formula":"κ-(BEDT-TTF)2Cu(NCS)2","sample":"Izawa2T angular thermal transport","recordType":"experiment","reportedTemperatureK":0.43,"tcK":null,"temperatureKind":"measurement","temperatureNote":"2T probe temperature; approximately0.2% C4 amplitude relative to total normal-state conductivity, not peak-to-peak span or electronic-only fraction; not Tc.","criterion":"angular-thermal-conductivity-probe","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"Heat current b, in-plane2T field, alignment better than0.01degree","sourceId":"source-9fb11dd7e1fcdc76","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-7","formula":"(TMTSF)2ClO4","sample":"Shinagawa slowly cooled specimens","recordType":"experiment","reportedTemperatureK":1.4,"tcK":1.4,"temperatureKind":"transition","temperatureNote":"Samples cooled7mK/min through24K anion ordering.","criterion":"resistive-and-rf-onset","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"Electrical resistance and reflected RF power","sourceId":"source-c08f058f3170fafa","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-8","formula":"(TMTSF)2ClO4","sample":"Shinagawa cooling protocol","recordType":"experiment","reportedTemperatureK":24,"tcK":null,"temperatureKind":"measurement","temperatureNote":"Anion ordering temperature, not superconducting Tc.","criterion":"anion-ordering-temperature","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"Cooling protocol7mK/min","sourceId":"source-c08f058f3170fafa","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-9","formula":"(TMTSF)2ClO4","sample":"Shinagawa NMR relaxation crossover","recordType":"experiment","reportedTemperatureK":0.1,"tcK":null,"temperatureKind":"measurement","temperatureNote":"100mK field sweep; crossover around15kOe within superconductivity, not Hc2 or Tc. Fig3 uses(T1T)^-1 and multiplies a-direction rates by6; resistance data are sampleA only due to missing B contact.","criterion":"spin-relaxation-probe","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"77Se NMR near a and b-prime; a-direction interlayer transport comparison, crossover near15kOe","sourceId":"source-c08f058f3170fafa","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-10","formula":"κ-(BEDT-TTF)2Cu2(CN)3","sample":"Shimizu spin-liquid candidate","recordType":"experiment","reportedTemperatureK":0.032,"tcK":null,"temperatureKind":"measurement","temperatureNote":"No magnetic order down to32mK is not a superconducting transition.","criterion":"lowest-magnetic-probe-temperature","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"NMR, reused scoped original abstract","sourceId":"source-9d15cd9236072f5c","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-11","formula":"κ-(BEDT-TTF)2Cu(NCS)2","sample":"Izawa2T angular thermal transport","recordType":"experiment","reportedTemperatureK":0.52,"tcK":null,"temperatureKind":"measurement","temperatureNote":"2T angular probe. Approximately0.2% C4 amplitude relative to total normal-state conductivity. Measurement condition, not superconducting Tc.","criterion":"angular-thermal-conductivity-probe","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"Heat current b, in-plane2T field, alignment better than0.01degree","sourceId":"source-9fb11dd7e1fcdc76","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-12","formula":"κ-(BEDT-TTF)2Cu(NCS)2","sample":"Izawa2T angular thermal transport","recordType":"experiment","reportedTemperatureK":0.72,"tcK":null,"temperatureKind":"measurement","temperatureNote":"2T angular probe. C4 amplitude below0.1% of total normal-state conductivity. Measurement condition, not superconducting Tc.","criterion":"angular-thermal-conductivity-probe","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"Heat current b, in-plane2T field, alignment better than0.01degree","sourceId":"source-9fb11dd7e1fcdc76","aliases":["organic","organic superconductors"]},{"id":"scwiki-d10-material-13","formula":"(TMTSF)2ClO4","sample":"Shinagawa40kOe shift measurement at100mK","recordType":"experiment","reportedTemperatureK":0.1,"tcK":null,"temperatureKind":"measurement","temperatureNote":"No observable shift change down to100mK at40kOe. Measurement floor, not Tc; high-field state remains unresolved.","criterion":"high-field-knight-shift-probe","pressureRegime":"ambient","pressureGPa":null,"equilibrium":"equilibrium","probe":"77Se relative shifts at40kOe, with normal-state first moment set to zero","sourceId":"source-c08f058f3170fafa","aliases":["organic","organic superconductors"]}],"body":"## Scope\n\nOrganic charge-transfer salts provide distinct low-dimensional settings for superconductivity. The Bechgaard salts (TMTSF)₂X have strongly anisotropic electronic motion; the κ-(BEDT-TTF)₂X family has conducting molecular layers and is widely studied near a pressure-controlled Mott transition. The anion, molecular packing, sample history and field direction are part of the material identity. A pairing assignment for one salt or field regime is not a classification of the entire family. [R3](#ref-source-2cc5358d54a65217) [R9](#ref-source-39706a37d6f5ce86) [R10](#ref-source-c08f058f3170fafa)\n\nThe 1980 Jérome report identifies superconductivity in (TMTSF)₂PF₆. Its bibliographic identity is checked here, while the original experimental text remains an access gap. For κ-Br, the 1990 Kini paper explicitly distinguishes an inductive onset of 11.6 K from a resistive onset of 12.5 K in its title. Those criteria should survive quotation and database export. Its original publication is July 1990; the publisher's 2002 online date does not move the discovery into a later decade. [R1](#ref-source-2c57ae9e6e679429) [R2](#ref-source-c3edeba243e544d9)\n\n## Mathematical assumptions\n\nIzawa's rotating-field thermal-conductivity analysis separates $\\kappa(\\theta)=C_0+C_2\\cos(2\\theta)+C_4\\cos(4\\theta)$, where the angle is between the heat current and the in-plane field. The large twofold term has a substantial phonon-scattering contribution, whereas the low-temperature fourfold term is interpreted through nodal quasiparticles. An independent synthetic harmonic-recovery check confirms the decomposition algebra, not the original fit or the inferred gap symmetry. A 45° rotation reverses the sign of the fourfold basis function, so node labels require a stated crystallographic convention. [R5](#ref-source-9fb11dd7e1fcdc76)\n\nThe normal-state anisotropic shift used by Shinagawa is $K=K_{\\mathrm{iso}}+K_{\\mathrm{ax}}(3\\cos^2\\theta-1)$, with $K_{\\mathrm{iso}}=3.9\\times10^{-4}$ and $K_{\\mathrm{ax}}=10.5\\times10^{-4}$. Substitution gives 2,490 ppm at 0° and −660 ppm at 90°. These are signed model contributions, not directly the observed superconducting change. Reducing the spin contribution can move resonance shifts in opposite directions for two orientations. Hyperfine calibration, chemical shifts, screening fields and pulse heating must therefore accompany a spin-pairing inference. [R10](#ref-source-c08f058f3170fafa)\n\nKagawa's transport analysis found approximate exponents $(\\delta,\\beta,\\gamma)=(2,1,1)$, satisfying $\\delta=1+\\gamma/\\beta$. Checking that identity does not independently validate a universality class. The analysis maps conductance onto an order parameter and treats pressure/temperature mixing within stated approximations; it excludes the closest region to the endpoint because of calibration and sample limitations. A later theoretical treatment shows how conductivity can couple to singular quantities other than the thermodynamic order parameter. Transport exponents and thermodynamic exponents must not be equated automatically. [R4](#ref-source-09e9a4299e3fd1d3) [R12](#ref-source-8e919dde44063203)\n\n## Experimental criteria\n\nLefebvre's κ-Cl phase diagram combines proton NMR with AC susceptibility under helium-gas pressure. NMR uses a 0.5 T field perpendicular to the layers; susceptibility uses an approximately 0.05 Oe oscillating field parallel to them, without a static field. Slow pressure and temperature sweeps, restricted to helium's fluid region, resolve hysteresis and changing phase fractions. The reported meeting region near 282 bar and 13.1 K is not evidence that antiferromagnetism and superconductivity occupy every microscopic volume together: the paper explicitly discusses inhomogeneous coexistence. [R3](#ref-source-2cc5358d54a65217)\n\nIn the separate κ-Cl conductance experiment, a critical endpoint occurs near 39.7 ± 0.1 K and 24.8 ± 0.1 MPa. Here the paper's symbol Tc denotes the Mott endpoint, not a superconducting transition. Four-probe measurements, helium pressure sweeps near 3 MPa per hour and a current-independence check over two orders of magnitude underpin this assignment. The endpoint pressure is 0.0248 GPa; confusing MPa with GPa would introduce a factor of one thousand. [R4](#ref-source-09e9a4299e3fd1d3)\n\nIzawa studies κ-(BEDT-TTF)₂Cu(NCS)₂ with a reported transition near 10.4 K. The accessed manuscript does not specify an onset criterion for that value; its resistivity check establishes field alignment, not a separately documented resistive Tc. Heat flows along b; the field rotates in the bc plane with alignment better than 0.01°. The sample is field-cooled with the field along b, and reversing the rotation produced no observed hysteresis. Figures 3–4 separate the constant and twofold terms before reporting the fourfold component at 2 T:\n\n| Probe temperature | Fourfold amplitude relative to normal-state total conductivity |\n|---|---|\n| 0.72 K | Less than 0.1% |\n| 0.52 K | Approximately 0.2% |\n| 0.43 K | Approximately 0.2% |\n\nHere the quoted fraction is $|C_4|/\\kappa_n$, not a peak-to-peak span and not a fraction of electronic conductivity alone. A pure cosine with 0.2% amplitude has a 0.4% peak-to-peak span; this is arithmetic from the stated harmonic, not a refit. These temperatures are measurement conditions, not additional Tc values. In the authors' low-temperature density-of-states interpretation, fourfold maxima for fields along b and c imply nodes rotated 45° from those axes. Competing vortex-scattering effects can change the transport interpretation with temperature and field; a symmetry label without that regime and coordinate convention is insufficient. [R5](#ref-source-9fb11dd7e1fcdc76)\n\nFor (TMTSF)₂ClO₄, Shinagawa's samples were cooled at 7 mK per minute through anion ordering near 24 K and showed resistive/rf onset near 1.4 K. Sample A was aligned near a, while sample B was aligned near b′. NMR pulses with tip angles below 3° were checked for heating by time-synchronous resistance measurements. Around 9.6 kOe, the resonance shifts move in opposite directions for these orientations, consistently with reduced spin susceptibility and anisotropic hyperfine coupling. The screening-field estimate below 100 ppm was obtained for sample B; it is not a universal correction for both samples.\n\nAt 100 mK, the relaxation crossover near 15 kOe lies within the superconducting regime. Figure 3 plots $(T_1T)^{-1}$ and multiplies the a-direction data by six: apparent overlap of the plotted curves does not mean equal unscaled rates. The accompanying interlayer resistance is for sample A with field along a; a missing contact prevented the corresponding reliable sample-B measurement. Resistance remains undetectable up to about 30 kOe in sample A, so the approximately 15 kOe crossover must not be substituted for its upper critical field. At 40 kOe the Knight shift shows no detectable change from the normal-state value down to 100 mK. Neither that observation nor the crossover uniquely identifies an FFLO or triplet state; the paper leaves the high-field state unresolved. Probe temperatures and anion ordering remain separate from superconducting Tc. [R10](#ref-source-c08f058f3170fafa)\n\n## Limits and disputes\n\nThe earlier Lee result concerns a different salt, (TMTSF)₂PF₆, at 7 kbar with field along the conducting a axis; its abstract reports little Knight-shift change and argues for triplet pairing. The later ClO₄ study finds a low-field singlet-compatible response and leaves its high-field state unresolved. These are condition-specific observations. High upper critical fields, unchanged shifts in one regime or proximity to spin-density-wave order cannot alone establish family-wide p-wave superconductivity. [R6](#ref-source-e055004651dafe18) [R10](#ref-source-c08f058f3170fafa)\n\nFor κ-(BEDT-TTF)₂Cu₂(CN)₃, absence of magnetic ordering down to 32 mK motivated a spin-liquid interpretation, while pressure studies found a neighboring superconducting region. Subsequent spin-gap work supports a valence-bond interpretation but does not uniquely exclude a gapped chiral spin liquid. Mounting strain and microcracks complicate comparison with a nominally hydrostatic experiment. Neither an exchange scale nor a spin-gap anomaly should become a superconducting Tc record. [R7](#ref-source-9d15cd9236072f5c) [R8](#ref-source-0443485ac20d3a8c) [R11](#ref-source-5e0dcd80e8b64a1b)\n\nThe original κ-Br reference in the pinned draft had an unrelated DOI. The correct identifier is 10.1021/ic00339a004; 10.1021/ic00331a012 identifies a metal-complex structural-analysis paper. This public article corrects the citation while preserving the fixed source file. Discovery-era methods, complete supplements, final-version comparisons and original-data refits remain outside parts of this scoped review. [R2](#ref-source-c3edeba243e544d9)\n\n## Discovery implications\n\nCompare pressure, chemical substitution and strain through measured phase diagrams rather than treating them as interchangeable tuning knobs. Report the exact salt, cooling protocol, pressure medium, field orientation and transition criterion before comparing performance. A useful next measurement should distinguish competing explanations—for example by combining bulk thermodynamics, low-heating spin probes and controlled-disorder studies on the same specimen. A nearby Mott state constrains a mechanism without identifying it uniquely. [R3](#ref-source-2cc5358d54a65217) [R4](#ref-source-09e9a4299e3fd1d3) [R10](#ref-source-c08f058f3170fafa)\n\nMolecular superconductors also provide a warning against copying symmetry names between coordinate systems. The κ-NCS thermal-conductivity paper discusses nodal directions relative to b and c as well as a rotated convention. Preserve those directions and the observable itself when comparing with theories. Fullerides belong to a separate molecular family with different orbital degeneracy and vibronic physics; the shared word “organic” does not make their pairing evidence interchangeable. [R5](#ref-source-9fb11dd7e1fcdc76) [R9](#ref-source-39706a37d6f5ce86)\n\n## Related topics\n\nContinue with [RVB and doped Mott insulators](/scwiki/rvb-and-doped-mott-insulators), [Mottness](/scwiki/mottness-and-superconductivity), [d-wave pairing](/scwiki/d-wave), [p-wave candidates](/scwiki/p-wave) and [fulleride superconductors](/scwiki/fulleride-superconductors).","revision":"3110dc62b5d43e33df86","sections":[{"id":"scope","title":"Scope","markdown":"## Scope\n\nOrganic charge-transfer salts provide distinct low-dimensional settings for superconductivity. The Bechgaard salts (TMTSF)₂X have strongly anisotropic electronic motion; the κ-(BEDT-TTF)₂X family has conducting molecular layers and is widely studied near a pressure-controlled Mott transition. The anion, molecular packing, sample history and field direction are part of the material identity. A pairing assignment for one salt or field regime is not a classification of the entire family. [R3](#ref-source-2cc5358d54a65217) [R9](#ref-source-39706a37d6f5ce86) [R10](#ref-source-c08f058f3170fafa)\n\nThe 1980 Jérome report identifies superconductivity in (TMTSF)₂PF₆. Its bibliographic identity is checked here, while the original experimental text remains an access gap. For κ-Br, the 1990 Kini paper explicitly distinguishes an inductive onset of 11.6 K from a resistive onset of 12.5 K in its title. Those criteria should survive quotation and database export. Its original publication is July 1990; the publisher's 2002 online date does not move the discovery into a later decade. [R1](#ref-source-2c57ae9e6e679429) [R2](#ref-source-c3edeba243e544d9)"},{"id":"mathematical-assumptions","title":"Mathematical assumptions","markdown":"## Mathematical assumptions\n\nIzawa's rotating-field thermal-conductivity analysis separates $\\kappa(\\theta)=C_0+C_2\\cos(2\\theta)+C_4\\cos(4\\theta)$, where the angle is between the heat current and the in-plane field. The large twofold term has a substantial phonon-scattering contribution, whereas the low-temperature fourfold term is interpreted through nodal quasiparticles. An independent synthetic harmonic-recovery check confirms the decomposition algebra, not the original fit or the inferred gap symmetry. A 45° rotation reverses the sign of the fourfold basis function, so node labels require a stated crystallographic convention. [R5](#ref-source-9fb11dd7e1fcdc76)\n\nThe normal-state anisotropic shift used by Shinagawa is $K=K_{\\mathrm{iso}}+K_{\\mathrm{ax}}(3\\cos^2\\theta-1)$, with $K_{\\mathrm{iso}}=3.9\\times10^{-4}$ and $K_{\\mathrm{ax}}=10.5\\times10^{-4}$. Substitution gives 2,490 ppm at 0° and −660 ppm at 90°. These are signed model contributions, not directly the observed superconducting change. Reducing the spin contribution can move resonance shifts in opposite directions for two orientations. Hyperfine calibration, chemical shifts, screening fields and pulse heating must therefore accompany a spin-pairing inference. [R10](#ref-source-c08f058f3170fafa)\n\nKagawa's transport analysis found approximate exponents $(\\delta,\\beta,\\gamma)=(2,1,1)$, satisfying $\\delta=1+\\gamma/\\beta$. Checking that identity does not independently validate a universality class. The analysis maps conductance onto an order parameter and treats pressure/temperature mixing within stated approximations; it excludes the closest region to the endpoint because of calibration and sample limitations. A later theoretical treatment shows how conductivity can couple to singular quantities other than the thermodynamic order parameter. Transport exponents and thermodynamic exponents must not be equated automatically. [R4](#ref-source-09e9a4299e3fd1d3) [R12](#ref-source-8e919dde44063203)"},{"id":"experimental-criteria","title":"Experimental criteria","markdown":"## Experimental criteria\n\nLefebvre's κ-Cl phase diagram combines proton NMR with AC susceptibility under helium-gas pressure. NMR uses a 0.5 T field perpendicular to the layers; susceptibility uses an approximately 0.05 Oe oscillating field parallel to them, without a static field. Slow pressure and temperature sweeps, restricted to helium's fluid region, resolve hysteresis and changing phase fractions. The reported meeting region near 282 bar and 13.1 K is not evidence that antiferromagnetism and superconductivity occupy every microscopic volume together: the paper explicitly discusses inhomogeneous coexistence. [R3](#ref-source-2cc5358d54a65217)\n\nIn the separate κ-Cl conductance experiment, a critical endpoint occurs near 39.7 ± 0.1 K and 24.8 ± 0.1 MPa. Here the paper's symbol Tc denotes the Mott endpoint, not a superconducting transition. Four-probe measurements, helium pressure sweeps near 3 MPa per hour and a current-independence check over two orders of magnitude underpin this assignment. The endpoint pressure is 0.0248 GPa; confusing MPa with GPa would introduce a factor of one thousand. [R4](#ref-source-09e9a4299e3fd1d3)\n\nIzawa studies κ-(BEDT-TTF)₂Cu(NCS)₂ with a reported transition near 10.4 K. The accessed manuscript does not specify an onset criterion for that value; its resistivity check establishes field alignment, not a separately documented resistive Tc. Heat flows along b; the field rotates in the bc plane with alignment better than 0.01°. The sample is field-cooled with the field along b, and reversing the rotation produced no observed hysteresis. Figures 3–4 separate the constant and twofold terms before reporting the fourfold component at 2 T:\n\n| Probe temperature | Fourfold amplitude relative to normal-state total conductivity |\n|---|---|\n| 0.72 K | Less than 0.1% |\n| 0.52 K | Approximately 0.2% |\n| 0.43 K | Approximately 0.2% |\n\nHere the quoted fraction is $|C_4|/\\kappa_n$, not a peak-to-peak span and not a fraction of electronic conductivity alone. A pure cosine with 0.2% amplitude has a 0.4% peak-to-peak span; this is arithmetic from the stated harmonic, not a refit. These temperatures are measurement conditions, not additional Tc values. In the authors' low-temperature density-of-states interpretation, fourfold maxima for fields along b and c imply nodes rotated 45° from those axes. Competing vortex-scattering effects can change the transport interpretation with temperature and field; a symmetry label without that regime and coordinate convention is insufficient. [R5](#ref-source-9fb11dd7e1fcdc76)\n\nFor (TMTSF)₂ClO₄, Shinagawa's samples were cooled at 7 mK per minute through anion ordering near 24 K and showed resistive/rf onset near 1.4 K. Sample A was aligned near a, while sample B was aligned near b′. NMR pulses with tip angles below 3° were checked for heating by time-synchronous resistance measurements. Around 9.6 kOe, the resonance shifts move in opposite directions for these orientations, consistently with reduced spin susceptibility and anisotropic hyperfine coupling. The screening-field estimate below 100 ppm was obtained for sample B; it is not a universal correction for both samples.\n\nAt 100 mK, the relaxation crossover near 15 kOe lies within the superconducting regime. Figure 3 plots $(T_1T)^{-1}$ and multiplies the a-direction data by six: apparent overlap of the plotted curves does not mean equal unscaled rates. The accompanying interlayer resistance is for sample A with field along a; a missing contact prevented the corresponding reliable sample-B measurement. Resistance remains undetectable up to about 30 kOe in sample A, so the approximately 15 kOe crossover must not be substituted for its upper critical field. At 40 kOe the Knight shift shows no detectable change from the normal-state value down to 100 mK. Neither that observation nor the crossover uniquely identifies an FFLO or triplet state; the paper leaves the high-field state unresolved. Probe temperatures and anion ordering remain separate from superconducting Tc. [R10](#ref-source-c08f058f3170fafa)"},{"id":"limits-and-disputes","title":"Limits and disputes","markdown":"## Limits and disputes\n\nThe earlier Lee result concerns a different salt, (TMTSF)₂PF₆, at 7 kbar with field along the conducting a axis; its abstract reports little Knight-shift change and argues for triplet pairing. The later ClO₄ study finds a low-field singlet-compatible response and leaves its high-field state unresolved. These are condition-specific observations. High upper critical fields, unchanged shifts in one regime or proximity to spin-density-wave order cannot alone establish family-wide p-wave superconductivity. [R6](#ref-source-e055004651dafe18) [R10](#ref-source-c08f058f3170fafa)\n\nFor κ-(BEDT-TTF)₂Cu₂(CN)₃, absence of magnetic ordering down to 32 mK motivated a spin-liquid interpretation, while pressure studies found a neighboring superconducting region. Subsequent spin-gap work supports a valence-bond interpretation but does not uniquely exclude a gapped chiral spin liquid. Mounting strain and microcracks complicate comparison with a nominally hydrostatic experiment. Neither an exchange scale nor a spin-gap anomaly should become a superconducting Tc record. [R7](#ref-source-9d15cd9236072f5c) [R8](#ref-source-0443485ac20d3a8c) [R11](#ref-source-5e0dcd80e8b64a1b)\n\nThe original κ-Br reference in the pinned draft had an unrelated DOI. The correct identifier is 10.1021/ic00339a004; 10.1021/ic00331a012 identifies a metal-complex structural-analysis paper. This public article corrects the citation while preserving the fixed source file. Discovery-era methods, complete supplements, final-version comparisons and original-data refits remain outside parts of this scoped review. [R2](#ref-source-c3edeba243e544d9)"},{"id":"discovery-implications","title":"Discovery implications","markdown":"## Discovery implications\n\nCompare pressure, chemical substitution and strain through measured phase diagrams rather than treating them as interchangeable tuning knobs. Report the exact salt, cooling protocol, pressure medium, field orientation and transition criterion before comparing performance. A useful next measurement should distinguish competing explanations—for example by combining bulk thermodynamics, low-heating spin probes and controlled-disorder studies on the same specimen. A nearby Mott state constrains a mechanism without identifying it uniquely. [R3](#ref-source-2cc5358d54a65217) [R4](#ref-source-09e9a4299e3fd1d3) [R10](#ref-source-c08f058f3170fafa)\n\nMolecular superconductors also provide a warning against copying symmetry names between coordinate systems. The κ-NCS thermal-conductivity paper discusses nodal directions relative to b and c as well as a rotated convention. Preserve those directions and the observable itself when comparing with theories. Fullerides belong to a separate molecular family with different orbital degeneracy and vibronic physics; the shared word “organic” does not make their pairing evidence interchangeable. [R5](#ref-source-9fb11dd7e1fcdc76) [R9](#ref-source-39706a37d6f5ce86)"},{"id":"related-topics","title":"Related topics","markdown":"## Related topics\n\nContinue with [RVB and doped Mott insulators](/scwiki/rvb-and-doped-mott-insulators), [Mottness](/scwiki/mottness-and-superconductivity), [d-wave pairing](/scwiki/d-wave), [p-wave candidates](/scwiki/p-wave) and [fulleride superconductors](/scwiki/fulleride-superconductors)."},{"id":"material-cases","title":"Material cases","markdown":"## Material cases\n\nValues describe individual reports, not a ranking. Unknown means the checked source did not supply the field at this review scope.\n\n| Material and sample | Reported temperature | Criterion | Probe | Pressure | State | Evidence |\n|---|---|---|---|---|---|---|\n| κ-(ET)2Cu[N(CN)2]Br (aliases: organic, organic superconductors); Kini κ-Br original title | 11.6 K; Different criterion from12.5K resistive onset; full methods not reviewed. | transition; inductive-onset | Inductive response; original title only | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c3edeba243e544d9) |\n| κ-(ET)2Cu[N(CN)2]Br (aliases: organic, organic superconductors); Kini κ-Br original title | 12.5 K; Same discovery report as11.6K inductive onset; not a later2002 discovery. | transition; resistive-onset | Electrical resistance; original title only | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c3edeba243e544d9) |\n| κ-(BEDT-TTF)2Cu[N(CN)2]Cl (aliases: organic, organic superconductors); Kagawa Mott endpoint | 39.7 K; 39.7±0.1K and24.8±0.1MPa; not a superconducting transition. | normal-state; mott-critical-endpoint | Four-probe DC conductance under helium pressure | high; 0.0248 to 0.0248 GPa | equilibrium | experiment; [source](#ref-source-09e9a4299e3fd1d3) |\n| κ-(BEDT-TTF)2Cu[N(CN)2]Cl (aliases: organic, organic superconductors); Lefebvre phase-meeting region | 13.1 K; Meeting of phase boundaries; inhomogeneous coexistence, not a homogeneous SC/AF proof. | measurement; phase-diagram-meeting-region | NMR0.5T perpendicular; AC0.05Oe parallel without static field | high; 0.0282 to 0.0282 GPa | equilibrium | experiment; [source](#ref-source-2cc5358d54a65217) |\n| κ-(BEDT-TTF)2Cu(NCS)2 (aliases: organic, organic superconductors); Izawa thermal-transport crystal | 10.4 K; 10.4K reported Tc; onset/zero/bulk criterion not independently established in the accessed manuscript. Simultaneous resistivity checks field alignment and does not establish this Tc criterion. | transition; reported-transition-unspecified | Reported Tc in manuscript abstract; transition criterion not specified | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9fb11dd7e1fcdc76) |\n| κ-(BEDT-TTF)2Cu(NCS)2 (aliases: organic, organic superconductors); Izawa2T angular thermal transport | 0.43 K; 2T probe temperature; approximately0.2% C4 amplitude relative to total normal-state conductivity, not peak-to-peak span or electronic-only fraction; not Tc. | measurement; angular-thermal-conductivity-probe | Heat current b, in-plane2T field, alignment better than0.01degree | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9fb11dd7e1fcdc76) |\n| (TMTSF)2ClO4 (aliases: organic, organic superconductors); Shinagawa slowly cooled specimens | 1.4 K; Samples cooled7mK/min through24K anion ordering. | transition; resistive-and-rf-onset | Electrical resistance and reflected RF power | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c08f058f3170fafa) |\n| (TMTSF)2ClO4 (aliases: organic, organic superconductors); Shinagawa cooling protocol | 24 K; Anion ordering temperature, not superconducting Tc. | measurement; anion-ordering-temperature | Cooling protocol7mK/min | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c08f058f3170fafa) |\n| (TMTSF)2ClO4 (aliases: organic, organic superconductors); Shinagawa NMR relaxation crossover | 0.1 K; 100mK field sweep; crossover around15kOe within superconductivity, not Hc2 or Tc. Fig3 uses(T1T)^-1 and multiplies a-direction rates by6; resistance data are sampleA only due to missing B contact. | measurement; spin-relaxation-probe | 77Se NMR near a and b-prime; a-direction interlayer transport comparison, crossover near15kOe | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c08f058f3170fafa) |\n| κ-(BEDT-TTF)2Cu2(CN)3 (aliases: organic, organic superconductors); Shimizu spin-liquid candidate | 0.032 K; No magnetic order down to32mK is not a superconducting transition. | measurement; lowest-magnetic-probe-temperature | NMR, reused scoped original abstract | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9d15cd9236072f5c) |\n| κ-(BEDT-TTF)2Cu(NCS)2 (aliases: organic, organic superconductors); Izawa2T angular thermal transport | 0.52 K; 2T angular probe. Approximately0.2% C4 amplitude relative to total normal-state conductivity. Measurement condition, not superconducting Tc. | measurement; angular-thermal-conductivity-probe | Heat current b, in-plane2T field, alignment better than0.01degree | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9fb11dd7e1fcdc76) |\n| κ-(BEDT-TTF)2Cu(NCS)2 (aliases: organic, organic superconductors); Izawa2T angular thermal transport | 0.72 K; 2T angular probe. C4 amplitude below0.1% of total normal-state conductivity. Measurement condition, not superconducting Tc. | measurement; angular-thermal-conductivity-probe | Heat current b, in-plane2T field, alignment better than0.01degree | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9fb11dd7e1fcdc76) |\n| (TMTSF)2ClO4 (aliases: organic, organic superconductors); Shinagawa40kOe shift measurement at100mK | 0.1 K; No observable shift change down to100mK at40kOe. Measurement floor, not Tc; high-field state remains unresolved. | measurement; high-field-knight-shift-probe | 77Se relative shifts at40kOe, with normal-state first moment set to zero | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c08f058f3170fafa) |"}],"markdown":"# Organic superconductors: charge-transfer salts, Mott physics and pairing probes\n\nCompare molecular salts through pressure, cooling history, nodal transport and spin response, while separating superconducting transitions from Mott endpoints and probe conditions.\n\n## Scope\n\nOrganic charge-transfer salts provide distinct low-dimensional settings for superconductivity. The Bechgaard salts (TMTSF)₂X have strongly anisotropic electronic motion; the κ-(BEDT-TTF)₂X family has conducting molecular layers and is widely studied near a pressure-controlled Mott transition. The anion, molecular packing, sample history and field direction are part of the material identity. A pairing assignment for one salt or field regime is not a classification of the entire family. [R3](#ref-source-2cc5358d54a65217) [R9](#ref-source-39706a37d6f5ce86) [R10](#ref-source-c08f058f3170fafa)\n\nThe 1980 Jérome report identifies superconductivity in (TMTSF)₂PF₆. Its bibliographic identity is checked here, while the original experimental text remains an access gap. For κ-Br, the 1990 Kini paper explicitly distinguishes an inductive onset of 11.6 K from a resistive onset of 12.5 K in its title. Those criteria should survive quotation and database export. Its original publication is July 1990; the publisher's 2002 online date does not move the discovery into a later decade. [R1](#ref-source-2c57ae9e6e679429) [R2](#ref-source-c3edeba243e544d9)\n\n## Mathematical assumptions\n\nIzawa's rotating-field thermal-conductivity analysis separates $\\kappa(\\theta)=C_0+C_2\\cos(2\\theta)+C_4\\cos(4\\theta)$, where the angle is between the heat current and the in-plane field. The large twofold term has a substantial phonon-scattering contribution, whereas the low-temperature fourfold term is interpreted through nodal quasiparticles. An independent synthetic harmonic-recovery check confirms the decomposition algebra, not the original fit or the inferred gap symmetry. A 45° rotation reverses the sign of the fourfold basis function, so node labels require a stated crystallographic convention. [R5](#ref-source-9fb11dd7e1fcdc76)\n\nThe normal-state anisotropic shift used by Shinagawa is $K=K_{\\mathrm{iso}}+K_{\\mathrm{ax}}(3\\cos^2\\theta-1)$, with $K_{\\mathrm{iso}}=3.9\\times10^{-4}$ and $K_{\\mathrm{ax}}=10.5\\times10^{-4}$. Substitution gives 2,490 ppm at 0° and −660 ppm at 90°. These are signed model contributions, not directly the observed superconducting change. Reducing the spin contribution can move resonance shifts in opposite directions for two orientations. Hyperfine calibration, chemical shifts, screening fields and pulse heating must therefore accompany a spin-pairing inference. [R10](#ref-source-c08f058f3170fafa)\n\nKagawa's transport analysis found approximate exponents $(\\delta,\\beta,\\gamma)=(2,1,1)$, satisfying $\\delta=1+\\gamma/\\beta$. Checking that identity does not independently validate a universality class. The analysis maps conductance onto an order parameter and treats pressure/temperature mixing within stated approximations; it excludes the closest region to the endpoint because of calibration and sample limitations. A later theoretical treatment shows how conductivity can couple to singular quantities other than the thermodynamic order parameter. Transport exponents and thermodynamic exponents must not be equated automatically. [R4](#ref-source-09e9a4299e3fd1d3) [R12](#ref-source-8e919dde44063203)\n\n## Experimental criteria\n\nLefebvre's κ-Cl phase diagram combines proton NMR with AC susceptibility under helium-gas pressure. NMR uses a 0.5 T field perpendicular to the layers; susceptibility uses an approximately 0.05 Oe oscillating field parallel to them, without a static field. Slow pressure and temperature sweeps, restricted to helium's fluid region, resolve hysteresis and changing phase fractions. The reported meeting region near 282 bar and 13.1 K is not evidence that antiferromagnetism and superconductivity occupy every microscopic volume together: the paper explicitly discusses inhomogeneous coexistence. [R3](#ref-source-2cc5358d54a65217)\n\nIn the separate κ-Cl conductance experiment, a critical endpoint occurs near 39.7 ± 0.1 K and 24.8 ± 0.1 MPa. Here the paper's symbol Tc denotes the Mott endpoint, not a superconducting transition. Four-probe measurements, helium pressure sweeps near 3 MPa per hour and a current-independence check over two orders of magnitude underpin this assignment. The endpoint pressure is 0.0248 GPa; confusing MPa with GPa would introduce a factor of one thousand. [R4](#ref-source-09e9a4299e3fd1d3)\n\nIzawa studies κ-(BEDT-TTF)₂Cu(NCS)₂ with a reported transition near 10.4 K. The accessed manuscript does not specify an onset criterion for that value; its resistivity check establishes field alignment, not a separately documented resistive Tc. Heat flows along b; the field rotates in the bc plane with alignment better than 0.01°. The sample is field-cooled with the field along b, and reversing the rotation produced no observed hysteresis. Figures 3–4 separate the constant and twofold terms before reporting the fourfold component at 2 T:\n\n| Probe temperature | Fourfold amplitude relative to normal-state total conductivity |\n|---|---|\n| 0.72 K | Less than 0.1% |\n| 0.52 K | Approximately 0.2% |\n| 0.43 K | Approximately 0.2% |\n\nHere the quoted fraction is $|C_4|/\\kappa_n$, not a peak-to-peak span and not a fraction of electronic conductivity alone. A pure cosine with 0.2% amplitude has a 0.4% peak-to-peak span; this is arithmetic from the stated harmonic, not a refit. These temperatures are measurement conditions, not additional Tc values. In the authors' low-temperature density-of-states interpretation, fourfold maxima for fields along b and c imply nodes rotated 45° from those axes. Competing vortex-scattering effects can change the transport interpretation with temperature and field; a symmetry label without that regime and coordinate convention is insufficient. [R5](#ref-source-9fb11dd7e1fcdc76)\n\nFor (TMTSF)₂ClO₄, Shinagawa's samples were cooled at 7 mK per minute through anion ordering near 24 K and showed resistive/rf onset near 1.4 K. Sample A was aligned near a, while sample B was aligned near b′. NMR pulses with tip angles below 3° were checked for heating by time-synchronous resistance measurements. Around 9.6 kOe, the resonance shifts move in opposite directions for these orientations, consistently with reduced spin susceptibility and anisotropic hyperfine coupling. The screening-field estimate below 100 ppm was obtained for sample B; it is not a universal correction for both samples.\n\nAt 100 mK, the relaxation crossover near 15 kOe lies within the superconducting regime. Figure 3 plots $(T_1T)^{-1}$ and multiplies the a-direction data by six: apparent overlap of the plotted curves does not mean equal unscaled rates. The accompanying interlayer resistance is for sample A with field along a; a missing contact prevented the corresponding reliable sample-B measurement. Resistance remains undetectable up to about 30 kOe in sample A, so the approximately 15 kOe crossover must not be substituted for its upper critical field. At 40 kOe the Knight shift shows no detectable change from the normal-state value down to 100 mK. Neither that observation nor the crossover uniquely identifies an FFLO or triplet state; the paper leaves the high-field state unresolved. Probe temperatures and anion ordering remain separate from superconducting Tc. [R10](#ref-source-c08f058f3170fafa)\n\n## Limits and disputes\n\nThe earlier Lee result concerns a different salt, (TMTSF)₂PF₆, at 7 kbar with field along the conducting a axis; its abstract reports little Knight-shift change and argues for triplet pairing. The later ClO₄ study finds a low-field singlet-compatible response and leaves its high-field state unresolved. These are condition-specific observations. High upper critical fields, unchanged shifts in one regime or proximity to spin-density-wave order cannot alone establish family-wide p-wave superconductivity. [R6](#ref-source-e055004651dafe18) [R10](#ref-source-c08f058f3170fafa)\n\nFor κ-(BEDT-TTF)₂Cu₂(CN)₃, absence of magnetic ordering down to 32 mK motivated a spin-liquid interpretation, while pressure studies found a neighboring superconducting region. Subsequent spin-gap work supports a valence-bond interpretation but does not uniquely exclude a gapped chiral spin liquid. Mounting strain and microcracks complicate comparison with a nominally hydrostatic experiment. Neither an exchange scale nor a spin-gap anomaly should become a superconducting Tc record. [R7](#ref-source-9d15cd9236072f5c) [R8](#ref-source-0443485ac20d3a8c) [R11](#ref-source-5e0dcd80e8b64a1b)\n\nThe original κ-Br reference in the pinned draft had an unrelated DOI. The correct identifier is 10.1021/ic00339a004; 10.1021/ic00331a012 identifies a metal-complex structural-analysis paper. This public article corrects the citation while preserving the fixed source file. Discovery-era methods, complete supplements, final-version comparisons and original-data refits remain outside parts of this scoped review. [R2](#ref-source-c3edeba243e544d9)\n\n## Discovery implications\n\nCompare pressure, chemical substitution and strain through measured phase diagrams rather than treating them as interchangeable tuning knobs. Report the exact salt, cooling protocol, pressure medium, field orientation and transition criterion before comparing performance. A useful next measurement should distinguish competing explanations—for example by combining bulk thermodynamics, low-heating spin probes and controlled-disorder studies on the same specimen. A nearby Mott state constrains a mechanism without identifying it uniquely. [R3](#ref-source-2cc5358d54a65217) [R4](#ref-source-09e9a4299e3fd1d3) [R10](#ref-source-c08f058f3170fafa)\n\nMolecular superconductors also provide a warning against copying symmetry names between coordinate systems. The κ-NCS thermal-conductivity paper discusses nodal directions relative to b and c as well as a rotated convention. Preserve those directions and the observable itself when comparing with theories. Fullerides belong to a separate molecular family with different orbital degeneracy and vibronic physics; the shared word “organic” does not make their pairing evidence interchangeable. [R5](#ref-source-9fb11dd7e1fcdc76) [R9](#ref-source-39706a37d6f5ce86)\n\n## Related topics\n\nContinue with [RVB and doped Mott insulators](/scwiki/rvb-and-doped-mott-insulators), [Mottness](/scwiki/mottness-and-superconductivity), [d-wave pairing](/scwiki/d-wave), [p-wave candidates](/scwiki/p-wave) and [fulleride superconductors](/scwiki/fulleride-superconductors).\n\n## Material cases\n\nValues describe individual reports, not a ranking. Unknown means the checked source did not supply the field at this review scope.\n\n| Material and sample | Reported temperature | Criterion | Probe | Pressure | State | Evidence |\n|---|---|---|---|---|---|---|\n| κ-(ET)2Cu[N(CN)2]Br (aliases: organic, organic superconductors); Kini κ-Br original title | 11.6 K; Different criterion from12.5K resistive onset; full methods not reviewed. | transition; inductive-onset | Inductive response; original title only | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c3edeba243e544d9) |\n| κ-(ET)2Cu[N(CN)2]Br (aliases: organic, organic superconductors); Kini κ-Br original title | 12.5 K; Same discovery report as11.6K inductive onset; not a later2002 discovery. | transition; resistive-onset | Electrical resistance; original title only | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c3edeba243e544d9) |\n| κ-(BEDT-TTF)2Cu[N(CN)2]Cl (aliases: organic, organic superconductors); Kagawa Mott endpoint | 39.7 K; 39.7±0.1K and24.8±0.1MPa; not a superconducting transition. | normal-state; mott-critical-endpoint | Four-probe DC conductance under helium pressure | high; 0.0248 to 0.0248 GPa | equilibrium | experiment; [source](#ref-source-09e9a4299e3fd1d3) |\n| κ-(BEDT-TTF)2Cu[N(CN)2]Cl (aliases: organic, organic superconductors); Lefebvre phase-meeting region | 13.1 K; Meeting of phase boundaries; inhomogeneous coexistence, not a homogeneous SC/AF proof. | measurement; phase-diagram-meeting-region | NMR0.5T perpendicular; AC0.05Oe parallel without static field | high; 0.0282 to 0.0282 GPa | equilibrium | experiment; [source](#ref-source-2cc5358d54a65217) |\n| κ-(BEDT-TTF)2Cu(NCS)2 (aliases: organic, organic superconductors); Izawa thermal-transport crystal | 10.4 K; 10.4K reported Tc; onset/zero/bulk criterion not independently established in the accessed manuscript. Simultaneous resistivity checks field alignment and does not establish this Tc criterion. | transition; reported-transition-unspecified | Reported Tc in manuscript abstract; transition criterion not specified | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9fb11dd7e1fcdc76) |\n| κ-(BEDT-TTF)2Cu(NCS)2 (aliases: organic, organic superconductors); Izawa2T angular thermal transport | 0.43 K; 2T probe temperature; approximately0.2% C4 amplitude relative to total normal-state conductivity, not peak-to-peak span or electronic-only fraction; not Tc. | measurement; angular-thermal-conductivity-probe | Heat current b, in-plane2T field, alignment better than0.01degree | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9fb11dd7e1fcdc76) |\n| (TMTSF)2ClO4 (aliases: organic, organic superconductors); Shinagawa slowly cooled specimens | 1.4 K; Samples cooled7mK/min through24K anion ordering. | transition; resistive-and-rf-onset | Electrical resistance and reflected RF power | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c08f058f3170fafa) |\n| (TMTSF)2ClO4 (aliases: organic, organic superconductors); Shinagawa cooling protocol | 24 K; Anion ordering temperature, not superconducting Tc. | measurement; anion-ordering-temperature | Cooling protocol7mK/min | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c08f058f3170fafa) |\n| (TMTSF)2ClO4 (aliases: organic, organic superconductors); Shinagawa NMR relaxation crossover | 0.1 K; 100mK field sweep; crossover around15kOe within superconductivity, not Hc2 or Tc. Fig3 uses(T1T)^-1 and multiplies a-direction rates by6; resistance data are sampleA only due to missing B contact. | measurement; spin-relaxation-probe | 77Se NMR near a and b-prime; a-direction interlayer transport comparison, crossover near15kOe | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c08f058f3170fafa) |\n| κ-(BEDT-TTF)2Cu2(CN)3 (aliases: organic, organic superconductors); Shimizu spin-liquid candidate | 0.032 K; No magnetic order down to32mK is not a superconducting transition. | measurement; lowest-magnetic-probe-temperature | NMR, reused scoped original abstract | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9d15cd9236072f5c) |\n| κ-(BEDT-TTF)2Cu(NCS)2 (aliases: organic, organic superconductors); Izawa2T angular thermal transport | 0.52 K; 2T angular probe. Approximately0.2% C4 amplitude relative to total normal-state conductivity. Measurement condition, not superconducting Tc. | measurement; angular-thermal-conductivity-probe | Heat current b, in-plane2T field, alignment better than0.01degree | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9fb11dd7e1fcdc76) |\n| κ-(BEDT-TTF)2Cu(NCS)2 (aliases: organic, organic superconductors); Izawa2T angular thermal transport | 0.72 K; 2T angular probe. C4 amplitude below0.1% of total normal-state conductivity. Measurement condition, not superconducting Tc. | measurement; angular-thermal-conductivity-probe | Heat current b, in-plane2T field, alignment better than0.01degree | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-9fb11dd7e1fcdc76) |\n| (TMTSF)2ClO4 (aliases: organic, organic superconductors); Shinagawa40kOe shift measurement at100mK | 0.1 K; No observable shift change down to100mK at40kOe. Measurement floor, not Tc; high-field state remains unresolved. | measurement; high-field-knight-shift-probe | 77Se relative shifts at40kOe, with normal-state first moment set to zero | ambient; unknown GPa | equilibrium | experiment; [source](#ref-source-c08f058f3170fafa) |\n\n## Sources\n\n### Ref source-2c57ae9e6e679429\n\n[R1] Superconductivity in a synthetic organic conductor (TMTSF)2PF6 (1980). [DOI 10.1051/jphyslet:0198000410409500](https://doi.org/10.1051/jphyslet:0198000410409500). Publication: journal-article. Check: bibliographic-identity-only. Checked: 2026-10-18. Crossref original identity checked. Original PDF403 and HAL anti-bot page; experimental methods and discovery temperature not independently reviewed here.\n### Ref source-c3edeba243e544d9\n\n[R2] A new ambient-pressure organic superconductor, κ-(ET)2Cu[N(CN)2]Br, with the highest transition temperature yet observed (inductive onset Tc = 11.6 K, resistive onset = 12.5 K) (1990). [DOI 10.1021/ic00339a004](https://doi.org/10.1021/ic00339a004). Publication: journal-article. Check: publisher-title-and-issue-metadata. Checked: 2026-10-18. Original1July1990, Inorganic Chemistry29,2555–2557; online1May2002 is digitization. Title preserves distinct inductive and resistive criteria. Full methods unavailable. Incorrect pinned ic00331a012 separately verified through Crossref as an unrelated metal-complex structural analysis.\n### Ref source-2cc5358d54a65217\n\n[R3] Mott transition, antiferromagnetism, and unconventional superconductivity in layered organic superconductors (2000). [DOI 10.1103/PhysRevLett.85.5420](https://doi.org/10.1103/PhysRevLett.85.5420). Publication: journal-article. Check: selected-author-phase-diagram-and-probe-conditions. Checked: 2026-10-18. Authorv1 submitted26April2000; journal18December2000. Selected pp1–2 read for helium sweeps, simultaneous NMR versus susceptibility conditions and inhomogeneous coexistence. Final-version comparison and raw phase-fraction analysis pending.\n### Ref source-09e9a4299e3fd1d3\n\n[R4] Unconventional critical behaviour in a quasi-two-dimensional organic conductor (2005). [DOI 10.1038/nature03806](https://doi.org/10.1038/nature03806). Publication: journal-article. Check: selected-author-transport-and-scaling-passages. Checked: 2026-10-18. Journal28July2005; author upload3March2006. Selected pp1–3 and5 read: four-probe helium-pressure conductance,39.7K24.8MPa Mott endpoint, exponents, excluded closest region and order-parameter/scaling assumptions. Full methods, supplement and raw fits not reviewed.\n### Ref source-9fb11dd7e1fcdc76\n\n[R5] Superconducting Gap Structure of κ-(BEDT-TTF)2Cu(NCS)2 Probed by Thermal Conductivity Tensor (2002). [DOI 10.1103/PhysRevLett.88.027002](https://doi.org/10.1103/PhysRevLett.88.027002). Publication: journal-article. Check: selected-author-amplitude-normalization-and-nodal-interpretation. Checked: 2026-10-20. Authorv2 dated9November2001. Re-read selected pp2–4; p3Figs3–4 visually inspected.2T,0.72/0.52/0.43K,C4/kappa_n<0.1%/about0.2%/about0.2%; amplitude not peak-to-peak or electronic-only normalization. Fieldcooling/rotation reversal, DOS-vs-scattering regime and b/c-axis maxima retained. Full final comparison/raw refit pending. Reported10.4K Tc appears in abstract without onset criterion; simultaneous resistivity is described as alignment verification, so previous resistive label withdrawn.\n### Ref source-e055004651dafe18\n\n[R6] Triplet Superconductivity in an Organic Superconductor Probed by NMR Knight Shift (2002). [DOI 10.1103/PhysRevLett.88.017004](https://doi.org/10.1103/PhysRevLett.88.017004). Publication: journal-article. Check: publisher-abstract-only. Checked: 2026-10-18. Published19December2001,2002issue. PF6 at7kbar with fieldalong a: unchanged shift and triplet interpretation. Full methods not reviewed; earlier cond-mat/0001332 author list differs and equivalence was not established.\n### Ref source-9d15cd9236072f5c\n\n[R7] Spin Liquid State in an Organic Mott Insulator with a Triangular Lattice (2003). [DOI 10.1103/PhysRevLett.91.107001](https://doi.org/10.1103/PhysRevLett.91.107001). Publication: journal-article. Check: publisher-abstract-scoped-check. Checked: 2026-10-18. Reused B9 scoped review with unchanged access/version limits. Abstract: NMR absence of order down to32mK and susceptibility exchange scale about250K. Neither is Tc; full methods not reviewed.\n### Ref source-0443485ac20d3a8c\n\n[R8] Mott Transition from a Spin Liquid to a Fermi Liquid in the Spin-Frustrated Organic Conductor kappa-(ET)2Cu2(CN)3 (2005). [DOI 10.1103/PhysRevLett.95.177001](https://doi.org/10.1103/PhysRevLett.95.177001). Publication: journal-article. Check: publisher-abstract-scoped-check. Checked: 2026-10-18. Reused B9 scoped review with unchanged access/version limits. Pressure NMR/resistivity phase diagram and neighboring superconductivity; no causal RVB mechanism established. Full data not reviewed.\n### Ref source-39706a37d6f5ce86\n\n[R9] Mott Physics in Organic Conductors with Triangular Lattices (2011). [DOI 10.1146/annurev-conmatphys-062910-140521](https://doi.org/10.1146/annurev-conmatphys-062910-140521). Publication: journal-article. Check: publisher-review-abstract-and-metadata. Checked: 2026-10-18. Advance12January2011,volume2,167–188,March2011. Abstract overview of triangular organic Mott systems checked; full review and material-specific hopping parameters not reviewed.\n### Ref source-c08f058f3170fafa\n\n[R10] Superconducting State of the Organic Conductor (TMTSF)2ClO4 (2007). [DOI 10.1103/PhysRevLett.98.147002](https://doi.org/10.1103/PhysRevLett.98.147002). Publication: journal-article. Check: selected-author-sample-field-and-scaled-relaxation-figure. Checked: 2026-10-20. Authorv2 dated3April2007 verified on arXiv; generated2018 date is not publication. Selected pp2–4/Figs1–3 read; pp2–3 figure pixels inspected. SampleA near a,B near b-prime; low-tip heating checks, B screening bound,100mK crossover and a-only transport separated. Fig3 axis(T1T)^-1 with a-direction multiplied6 despite terse caption sayingT1^-1.40kOe unchanged shifts do not uniquely identify high-field pairing. No final-version comparison/raw fit.\n### Ref source-5e0dcd80e8b64a1b\n\n[R11] Chasing the spin gap through the phase diagram of a frustrated Mott insulator (2023). [DOI 10.1038/s41467-023-37491-z](https://doi.org/10.1038/s41467-023-37491-z). Publication: journal-article. Check: published-primary-passages-scoped-check. Checked: 2026-10-18. Reused B9 scoped review with unchanged access/version limits. Published pp.1–5 selected results,discussion,methods and data analysis; Fig4/discussion visually checked. Substrate strain and inferred hydrostatic-equivalent pressure, VBS interpretation with gapped chiral QSL not excluded, mounting microcracks retained. Raw-data audit pending.\n### Ref source-8e919dde44063203\n\n[R12] Universality of Liquid-Gas Mott Transitions at Finite Temperatures (2008). [DOI 10.1103/PhysRevLett.100.026408](https://doi.org/10.1103/PhysRevLett.100.026408). Publication: journal-article. Check: publisher-theory-abstract-only. Checked: 2026-10-18. Published18January2008. Abstract distinguishes Ising thermodynamic order from conductivity coupling, disorder and dimensional crossover. Full theoretical proof not reviewed; not a unique resolution for all organic systems.\n\n## Claim evidence and conditions\n\n### scwiki-d10-claim-scope-1\n\nOrganic charge-transfer salts provide distinct low-dimensional settings for superconductivity. The Bechgaard salts (TMTSF)₂X have strongly anisotropic electronic motion; the κ-(BEDT-TTF)₂X family has conducting molecular layers and is widely studied near a pressure-controlled Mott transition. The anion, molecular packing, sample history and field direction are part of the material identity. A pairing assignment for one salt or field regime is not a classification of the entire family.\n\nEvidence: experiment. Sources: source-2cc5358d54a65217, source-39706a37d6f5ce86, source-c08f058f3170fafa.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-scope-2\n\nThe 1980 Jérome report identifies superconductivity in (TMTSF)₂PF₆. Its bibliographic identity is checked here, while the original experimental text remains an access gap. For κ-Br, the 1990 Kini paper explicitly distinguishes an inductive onset of 11.6 K from a resistive onset of 12.5 K in its title. Those criteria should survive quotation and database export. Its original publication is July 1990; the publisher's 2002 online date does not move the discovery into a later decade.\n\nEvidence: experiment. Sources: source-2c57ae9e6e679429, source-c3edeba243e544d9.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-mathematical-assumptions-1\n\nIzawa's rotating-field thermal-conductivity analysis separates $\\kappa(\\theta)=C_0+C_2\\cos(2\\theta)+C_4\\cos(4\\theta)$, where the angle is between the heat current and the in-plane field. The large twofold term has a substantial phonon-scattering contribution, whereas the low-temperature fourfold term is interpreted through nodal quasiparticles. An independent synthetic harmonic-recovery check confirms the decomposition algebra, not the original fit or the inferred gap symmetry. A 45° rotation reverses the sign of the fourfold basis function, so node labels require a stated crystallographic convention.\n\nEvidence: theory. Sources: source-9fb11dd7e1fcdc76.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-mathematical-assumptions-2\n\nThe normal-state anisotropic shift used by Shinagawa is $K=K_{\\mathrm{iso}}+K_{\\mathrm{ax}}(3\\cos^2\\theta-1)$, with $K_{\\mathrm{iso}}=3.9\\times10^{-4}$ and $K_{\\mathrm{ax}}=10.5\\times10^{-4}$. Substitution gives 2,490 ppm at 0° and −660 ppm at 90°. These are signed model contributions, not directly the observed superconducting change. Reducing the spin contribution can move resonance shifts in opposite directions for two orientations. Hyperfine calibration, chemical shifts, screening fields and pulse heating must therefore accompany a spin-pairing inference.\n\nEvidence: theory. Sources: source-c08f058f3170fafa.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-mathematical-assumptions-3\n\nKagawa's transport analysis found approximate exponents $(\\delta,\\beta,\\gamma)=(2,1,1)$, satisfying $\\delta=1+\\gamma/\\beta$. Checking that identity does not independently validate a universality class. The analysis maps conductance onto an order parameter and treats pressure/temperature mixing within stated approximations; it excludes the closest region to the endpoint because of calibration and sample limitations. A later theoretical treatment shows how conductivity can couple to singular quantities other than the thermodynamic order parameter. Transport exponents and thermodynamic exponents must not be equated automatically.\n\nEvidence: theory. Sources: source-09e9a4299e3fd1d3, source-8e919dde44063203.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-experimental-criteria-1\n\nLefebvre's κ-Cl phase diagram combines proton NMR with AC susceptibility under helium-gas pressure. NMR uses a 0.5 T field perpendicular to the layers; susceptibility uses an approximately 0.05 Oe oscillating field parallel to them, without a static field. Slow pressure and temperature sweeps, restricted to helium's fluid region, resolve hysteresis and changing phase fractions. The reported meeting region near 282 bar and 13.1 K is not evidence that antiferromagnetism and superconductivity occupy every microscopic volume together: the paper explicitly discusses inhomogeneous coexistence.\n\nEvidence: experiment. Sources: source-2cc5358d54a65217.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-experimental-criteria-2\n\nIn the separate κ-Cl conductance experiment, a critical endpoint occurs near 39.7 ± 0.1 K and 24.8 ± 0.1 MPa. Here the paper's symbol Tc denotes the Mott endpoint, not a superconducting transition. Four-probe measurements, helium pressure sweeps near 3 MPa per hour and a current-independence check over two orders of magnitude underpin this assignment. The endpoint pressure is 0.0248 GPa; confusing MPa with GPa would introduce a factor of one thousand.\n\nEvidence: experiment. Sources: source-09e9a4299e3fd1d3.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-experimental-criteria-3\n\nIzawa studies κ-(BEDT-TTF)₂Cu(NCS)₂ with a reported transition near 10.4 K. The accessed manuscript does not specify an onset criterion for that value; its resistivity check establishes field alignment, not a separately documented resistive Tc. Heat flows along b; the field rotates in the bc plane with alignment better than 0.01°. The sample is field-cooled with the field along b, and reversing the rotation produced no observed hysteresis. Figures 3–4 separate the constant and twofold terms before reporting the fourfold component at 2 T:\n\n| Probe temperature | Fourfold amplitude relative to normal-state total conductivity |\n|---|---|\n| 0.72 K | Less than 0.1% |\n| 0.52 K | Approximately 0.2% |\n| 0.43 K | Approximately 0.2% |\n\nHere the quoted fraction is $|C_4|/\\kappa_n$, not a peak-to-peak span and not a fraction of electronic conductivity alone. A pure cosine with 0.2% amplitude has a 0.4% peak-to-peak span; this is arithmetic from the stated harmonic, not a refit. These temperatures are measurement conditions, not additional Tc values. In the authors' low-temperature density-of-states interpretation, fourfold maxima for fields along b and c imply nodes rotated 45° from those axes. Competing vortex-scattering effects can change the transport interpretation with temperature and field; a symmetry label without that regime and coordinate convention is insufficient.\n\nEvidence: experiment. Sources: source-9fb11dd7e1fcdc76.\n\nSource relationship: mixed-source-and-local-derivation. Izawa author-v2 Figs3–4 report the fourfold coefficient relative to total normal-state conductivity. Doubling a pure cosine amplitude to obtain its peak-to-peak span is local arithmetic; nodal directions retain the authors' DOS-regime interpretation and crystallographic convention, not an independent fit.\n\nConditions: Izawa author-v2,2T bc-plane rotation, heat current b, field-cooled along b; C4/kappa_n amplitude versus peak-to-peak span and electronic normalization separated. Reported10.4K Tc has unspecified onset criterion in the accessed version.\n\nVerification scope: Selected original author-v2 passages and figure pixels checked; no raw-data refit or complete final-version comparison.\n\n### scwiki-d10-claim-experimental-criteria-4\n\nFor (TMTSF)₂ClO₄, Shinagawa's samples were cooled at 7 mK per minute through anion ordering near 24 K and showed resistive/rf onset near 1.4 K. Sample A was aligned near a, while sample B was aligned near b′. NMR pulses with tip angles below 3° were checked for heating by time-synchronous resistance measurements. Around 9.6 kOe, the resonance shifts move in opposite directions for these orientations, consistently with reduced spin susceptibility and anisotropic hyperfine coupling. The screening-field estimate below 100 ppm was obtained for sample B; it is not a universal correction for both samples.\n\nAt 100 mK, the relaxation crossover near 15 kOe lies within the superconducting regime. Figure 3 plots $(T_1T)^{-1}$ and multiplies the a-direction data by six: apparent overlap of the plotted curves does not mean equal unscaled rates. The accompanying interlayer resistance is for sample A with field along a; a missing contact prevented the corresponding reliable sample-B measurement. Resistance remains undetectable up to about 30 kOe in sample A, so the approximately 15 kOe crossover must not be substituted for its upper critical field. At 40 kOe the Knight shift shows no detectable change from the normal-state value down to 100 mK. Neither that observation nor the crossover uniquely identifies an FFLO or triplet state; the paper leaves the high-field state unresolved. Probe temperatures and anion ordering remain separate from superconducting Tc.\n\nEvidence: experiment. Sources: source-c08f058f3170fafa.\n\nSource relationship: mixed-source-and-local-derivation. Shinagawa author-v2 Figs1–3 and text support sample/orientation-specific shifts, heating checks, plotted-rate scaling and a crossover within superconductivity. Keeping the crossover distinct from Hc2 and the temperatures distinct from Tc is editorial synthesis, not a new high-field phase identification.\n\nConditions: Shinagawa author-v2: sampleA near a/sampleB near b-prime;9.6kOe shifts,100mK field sweep,Fig3 plots(T1T)^-1 with a-direction multiplied by6; missing B transport contact;40kOe shift condition.\n\nVerification scope: Selected original author-v2 passages and figure pixels checked; no raw-data refit or complete final-version comparison.\n\n### scwiki-d10-claim-limits-and-disputes-1\n\nThe earlier Lee result concerns a different salt, (TMTSF)₂PF₆, at 7 kbar with field along the conducting a axis; its abstract reports little Knight-shift change and argues for triplet pairing. The later ClO₄ study finds a low-field singlet-compatible response and leaves its high-field state unresolved. These are condition-specific observations. High upper critical fields, unchanged shifts in one regime or proximity to spin-density-wave order cannot alone establish family-wide p-wave superconductivity.\n\nEvidence: experiment. Sources: source-e055004651dafe18, source-c08f058f3170fafa.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-limits-and-disputes-2\n\nFor κ-(BEDT-TTF)₂Cu₂(CN)₃, absence of magnetic ordering down to 32 mK motivated a spin-liquid interpretation, while pressure studies found a neighboring superconducting region. Subsequent spin-gap work supports a valence-bond interpretation but does not uniquely exclude a gapped chiral spin liquid. Mounting strain and microcracks complicate comparison with a nominally hydrostatic experiment. Neither an exchange scale nor a spin-gap anomaly should become a superconducting Tc record.\n\nEvidence: experiment. Sources: source-9d15cd9236072f5c, source-0443485ac20d3a8c, source-5e0dcd80e8b64a1b.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-limits-and-disputes-3\n\nThe original κ-Br reference in the pinned draft had an unrelated DOI. The correct identifier is 10.1021/ic00339a004; 10.1021/ic00331a012 identifies a metal-complex structural-analysis paper. This public article corrects the citation while preserving the fixed source file. Discovery-era methods, complete supplements, final-version comparisons and original-data refits remain outside parts of this scoped review.\n\nEvidence: experiment. Sources: source-c3edeba243e544d9.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-discovery-implications-1\n\nCompare pressure, chemical substitution and strain through measured phase diagrams rather than treating them as interchangeable tuning knobs. Report the exact salt, cooling protocol, pressure medium, field orientation and transition criterion before comparing performance. A useful next measurement should distinguish competing explanations—for example by combining bulk thermodynamics, low-heating spin probes and controlled-disorder studies on the same specimen. A nearby Mott state constrains a mechanism without identifying it uniquely.\n\nEvidence: theory. Sources: source-2cc5358d54a65217, source-09e9a4299e3fd1d3, source-c08f058f3170fafa.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n### scwiki-d10-claim-discovery-implications-2\n\nMolecular superconductors also provide a warning against copying symmetry names between coordinate systems. The κ-NCS thermal-conductivity paper discusses nodal directions relative to b and c as well as a rotated convention. Preserve those directions and the observable itself when comparing with theories. Fullerides belong to a separate molecular family with different orbital degeneracy and vibronic physics; the shared word “organic” does not make their pairing evidence interchangeable.\n\nEvidence: theory. Sources: source-9fb11dd7e1fcdc76, source-39706a37d6f5ce86.\n\nConditions: Salt, packing, pressure, cooling history, field direction, probe and transition criterion are distinct. Mott endpoints, anion ordering and probe temperatures are not superconducting Tc.\n\nVerification scope: Selected original passages and bounded observable algebra; abstract-only and access limits remain explicit. Full scientific acceptance is open.\n\n## Revision and review\n\nArticle ID: scwiki-d10. Revision: 3110dc62b5d43e33df86. Updated: 2026-10-20.\n\nReview scope: Selected Lefebvre phase/probe, Izawa angular-transport, Kagawa Mott-scaling and Shinagawa spin-response passages, plus scoped discovery metadata and prior B9 checks. Follow-up Izawa amplitude normalization/DOS interpretation and Shinagawa sample-specific field sweeps, plotted scaling and contact limitations.\n\n- Complete scientific acceptance, final-version comparisons and raw-data reproduction remain open.\n- Jerome1980 original text is inaccessible here; Kini1990 is title/metadata-only; Lee2001/2002 is abstract-only.\n- Kagawa full methods/supplement and Papanikolaou theoretical proof remain outside this check.\n- Synthetic algebra does not establish a unique gap symmetry, universality class or common mechanism across molecular families.\n\nSource: [D_material_families/D10_organic.md](https://github.com/JackZH26/jzis-superconductivity/blob/0a7c9d6696804ec26aa12f8eed68b55c9b3c0fcf/D_material_families/D10_organic.md), commit 0a7c9d6696804ec26aa12f8eed68b55c9b3c0fcf, SHA-256 753835b01f35ccd0de3ab00bf3f267a7bfe7f67991eadb0deb94f1031121045a.\n","wordCount":1321}}