Reviewed Leads and Controls

Mechanism hypothesis: Important bismuthate family anchor that should stay encoded as a doped oxide reference rather than be reduced to a generic conventional-metal analogy.

Copper-free oxide superconducting reference with experimentally reported transition near 30 K. This record is explicitly the single-phase Ba0.6K0.4BiO3 perovskite reported in the discovery paper; do not flatten it into generic BaBiO3, arbitrary K-doped bismuthates, or oxygen-unconstrained mixtures.

Mechanism hypothesis: Canonical 122 iron-based family anchor with doping-controlled superconductivity; wording stays in the correlated iron-pnictide lane rather than a simple conventional EPC label.

Foundational hole-doped 122 iron-pnictide superconducting record. The discovery report is for potassium-substituted compositions around x = 0.4; parent BaFe2As2 and end-member KFe2As2 are not the same superconducting context encoded here.

Mechanism hypothesis: Useful framework superconductor reference for non-layered covalent-network branches; no stronger mechanism claim is made here.

Clathrate superconductor baseline record for the light-framework branch. This baseline record refers to the [internal path] synthesized Ba8Si46 clathrate phase reported in the original discovery paper.

Mechanism hypothesis: Layered Bi-2212 high-Tc cuprate reference.

Experimentally established Bi-2212 cuprate reference with well-known high-Tc layered superconductivity. This row refers to the oxygen-doped Bi2Sr2CaCu2O8+δ superconducting context; it should remain a literature anchor rather than a DFT-only exploratory row.

Mechanism hypothesis: Reference layered intercalation superconductor retained for family coverage and conventional-EPC-adjacent benchmarking.

Bulk graphite-intercalation superconductor with experimentally reported transition at ambient pressure. This record refers to bulk rhombohedral CaC6 synthesized as a calcium-intercalated graphite compound; do not flatten it into generic graphite or generic calcium-carbon mixtures.

Mechanism hypothesis: Useful higher-Tc fulleride anchor for the molecular-superconductor branch, with composition-sensitive density-of-states interpretation already noted in the discovery paper.

Mixed-alkali fulleride reference with experimentally reported molecular-superconductor transition above the K3C60 baseline. The cited record is specifically for mixed Cs_xRb_yC60 prepared with dopant feed x = 2 and y = 1; this is not a claim about arbitrary Cs-only or Rb-only fulleride compositions.

Mechanism hypothesis: High-Tc multilayer cuprate ceiling reference with strongly correlation-sensitive, doping-tuned superconductivity.

Experimentally established Hg-1223 cuprate reference rather than a loop-generated exploratory row. The established superconducting phase is the oxygen-tuned Hg-1223 family usually written HgBa2Ca2Cu3O8+δ; this row should remain a literature anchor, not a new discovery candidate.

Mechanism hypothesis: Canonical molecular-superconductor family anchor; keep the wording in the fulleride lane rather than forcing a simplified elemental or intermetallic analogy.

Foundational alkali-fulleride superconducting record with experimentally reported transition in doped C60. The superconducting context is potassium-doped C60 in the K3C60 fulleride regime; the source distinguishes thin-film onset behavior from bulk Meissner evidence and should not be collapsed into undoped C60.

Mechanism hypothesis: Optimally Sr-doped LSCO cuprate reference.

Experimentally established Sr-doped La2-xSrxCuO4 cuprate reference near the classic superconducting dome. This row refers to the explicitly Sr-doped superconducting LSCO context; it should remain a literature anchor rather than a DFT-only exploratory row.

Mechanism hypothesis: Discovery-era iron-pnictide anchor; mechanism remains in the correlated iron-based family and is not relabeled as simple conventional EPC.

Foundational fluorine-doped iron-pnictide superconducting record. Superconductivity is reported for fluorine-doped compositions around x = 0.05-0.12; undoped LaOFeAs is not the superconducting state referenced here.

Mechanism hypothesis: High-Tc member of the doped MNCl layered nitride-halide family; strongly condition-sensitive.

Intercalation-induced superconductivity in the beta-HfNCl family. Superconductivity requires electron doping via lithium intercalation; parent beta-HfNCl is not the superconducting state referenced here.

Mechanism hypothesis: Layered nitride-halide family with doping-sensitive superconductivity; mechanism remains outside a simple MgB2-style proxy.

Electron-doped layered nitride halide superconductor. Superconductivity requires lithium [internal path] doping; undoped beta-ZrNCl is not the superconducting state referenced here.

Mechanism hypothesis: Conservative low-temperature intermetallic reference retained for family coverage; literature discusses electron-phonon coupling with possible additional magnetic complexity.

Low-Tc intermetallic superconducting reference with experimentally reported bulk transition. Ambient-pressure bulk Mo3Sb7 specific-heat literature context; this record does not generalize to pressure-tuned or Te-substituted variants.

Mechanism hypothesis: Early higher-Tc 1111 iron-based reference showing the rapid rare-earth optimization of the discovery-era pnictide family.

Rare-earth 1111 iron-pnictide record above the LaO1-xFxFeAs baseline. Superconductivity is reported for fluorine-doped SmFeAsO1-xFx; the undoped parent is not the superconducting state referenced here.

Mechanism hypothesis: Multilayer thallium cuprate reference for the upper-Tc cuprate branch.

Experimentally established Tl-2223 bulk cuprate reference, not a new bounded DFT-only candidate. This row refers to the established Tl-2223 superconducting phase reported in the experimental literature; it should not remain in the public corpus as an unconfirmed exploratory candidate.

Mechanism hypothesis: Canonical optimally oxygenated 123 cuprate reference.

Experimentally established YBCO high-Tc cuprate reference above liquid-nitrogen temperature. This row refers to the oxygenated YBa2Cu3O7-δ superconducting context; it should remain a literature anchor rather than a DFT-only exploratory row.

Mechanism hypothesis: Historic heavy-fermion mechanism anchor showing superconductivity emerging in a strongly correlated Kondo-lattice environment.

Foundational heavy-fermion superconducting record discovered in the late 1970s. This record refers to superconductivity in CeCu2Si2 itself and should remain in the heavy-fermion / strong-correlation lane rather than being collapsed into a simple low-Tc intermetallic baseline.

Mechanism hypothesis: Kagome-system superconductivity intertwined with [internal path] phenomenology; mechanism should not be collapsed into a conventional EPC label.

Ambient-pressure kagome superconductor with intertwined charge order and superconductivity. Ambient-pressure bulk [internal path] literature context; no doping or high-pressure condition encoded in this baseline record.

Mechanism hypothesis: CuxBi2Se3, Tc~3.8K

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Topological-doped superconducting family anchor with unconventional pairing interest; do not collapse to a conventional EPC label.

Topological-superconductor candidate family derived from Cu-intercalated Bi2Se3. Superconductivity is reported for copper-intercalated compositions around 0.12<=x<=0.15; undoped Bi2Se3 is not the superconducting state referenced here.

Mechanism hypothesis: Minimal iron-chalcogenide superconducting family anchor; mechanism is not reduced here to a simple conventional EPC label.

Ambient-pressure iron-based superconductor baseline in the FeSe family. The baseline superconducting record is the PbO-type alpha-FeSe report with intentional selenium deficiency; do not generalize this number to arbitrary pressure, film, or intercalated FeSe variants.

Mechanism hypothesis: K version, Tc~0.9K

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Historic first high-Tc cuprate discovery; mechanism remains in the unconventional cuprate space and is not reduced here to a conventional EPC label.

Foundational hole-doped cuprate superconductor record. The reported superconducting state is Ba-doped La-Cu-O; the parent undoped La2CuO4 is not the superconducting state referenced here.

Mechanism hypothesis: Intrinsic 111 iron-based superconducting family anchor; mechanism remains in the iron-based unconventional space rather than a simple MgB2-style EPC picture.

Ambient-pressure stoichiometric iron-pnictide superconductor. Reported for the stoichiometric LiFeAs system; this record does not encode pressure or substitution tuning.

Mechanism hypothesis: Reference unconventional oxide superconductor outside the cuprate and iron-pnictide branches; pairing symmetry remains scientifically sensitive, so wording stays conservative.

Ambient-pressure unconventional layered-oxide superconductor baseline. The discovery record refers to high-quality Sr2RuO4 crystals at ambient pressure; disorder strongly suppresses Tc and should remain explicit in later variants.

Mechanism hypothesis: Mechanism-complex heavy-fermion anchor retained to keep the unconventional strong-correlation branch explicit in the credible corpus.

Early unconventional heavy-fermion superconducting record with sub-kelvin bulk transition. This record is for bulk UBe13 in its heavy-fermion superconducting context; do not flatten it into generic uranium-beryllium alloys or treat it as a conventional EPC control.

Mechanism hypothesis: Canonical high-Tc cuprate family anchor with oxygen-ordering sensitivity and unconventional pairing physics.

Ambient-pressure high-Tc cuprate benchmark above liquid-nitrogen temperature. The literature discovery context is the oxygenated Y-Ba-Cu-O superconducting phase; oxygen deficiency strongly controls superconductivity and should not be flattened away.

Mechanism hypothesis: clean nonmagnetic borocarbide comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Canonical two-gap [internal path] conventional EPC superconductor with strong E2g boron phonon coupling.

Bulk conventional superconductor benchmark at ambient pressure. Ambient-pressure bulk MgB2 benchmark reference.

Mechanism hypothesis: Canonical elemental type-II conventional superconductor used as a baseline control in many superconducting-device contexts.

Bulk elemental superconducting reference for the highest-Tc elemental-metal baseline. Ambient-pressure bulk elemental Nb reference; cavity-grade surface treatments and alloy variants are not encoded here.

Mechanism hypothesis: High-field conventional intermetallic superconductor and core A15 family anchor; retained here as a reference record rather than a novelty claim.

Classic A15 intermetallic superconducting reference at ambient pressure. Baseline A15 Nb3Sn reference near stoichiometric composition; [internal path] tuning can shift the exact transition temperature.

Mechanism hypothesis: Strong-coupling conventional elemental superconductor with important spin-orbit physics, but this record does not upgrade beyond conservative reference language.

Bulk elemental superconducting reference at ambient pressure. Ambient-pressure bulk elemental Pb reference; thin-film and alloy variants are not encoded in this baseline record.

Mechanism hypothesis: elemental BCS superconductor

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Finite DOS at E_F in the loop-verified fixed-cell path is consistent with a conventional metallic nitride interpretation.

Loop-verified metallic nitride anchor; benchmark-adjacent conventional superconducting family. This reference context is film- and orientation-sensitive TiN; do not generalize the quoted Tc to arbitrary TiN morphologies or disorder regimes.

Mechanism hypothesis: elemental transition-metal superconductor

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: rare-earth borocarbide [internal path] interplay

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Square-ligand cuprate-adjacent comparator for nickelate-like charge-transfer reasoning.

Prescreen-stage square-ligand comparator retained as a bounded public research row; this row is meant to probe ligand-field transferability, not to imply an established superconducting doping window. This row is not a validated superconductivity claim and should not be presented as an already defined doped state.

Mechanism hypothesis: Al-O framework, interface SC relevant

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: light-element intermetallic frontier route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: sigma-band unfilled, check electron count

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Al nitride, wide gap, doping needed

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: boron-carbon conductor with EPC uncertainty

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: heterocovalent frontier hydride route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: mixed [internal path] frontier route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: graphite-like, B-C covalent, intercalation SC possible

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: sodalite-like mixed light-element frontier route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: explicit hole-doped 122 route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Useful mainline side branch for testing whether stronger ligand-field control can recover cuprate-like physics without using copper.

Prescreen-stage square-ligand candidate retained because it preserves an explicit layered nickel oxyfluoride route rather than collapsing back into generic nickel oxide metallicity. This is a DFT-screened exploratory row only; the interest lies in the square-ligand geometry and charge-transfer framing, not in any claimed measured Tc.

Mechanism hypothesis: clathrate analog

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Parent 122 iron-pnictide host with [internal path] competition; superconductivity emerges in tuned derivatives.

Prescreen-stage parent comparator retained as a bounded public research row; the superconducting context belongs to doped 122 derivatives rather than stoichiometric BaFe2As2 itself. This row is not a superconductivity claim for stoichiometric BaFe2As2. Any superconducting interpretation requires explicit chemical substitution or pressure tuning context.

Mechanism hypothesis: lighter anion iron-based comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: magnetic kagome-related boundary material

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: lower-pressure ternary hydride target

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Ferroelectric-side comparator rather than a mainline room-temperature candidate.

Prescreen-stage oxide comparator retained to test the ferroelectric-proximity side route. This is a DFT-screened exploratory record only; no direct superconductivity claim is implied for bulk stoichiometric BaTiO3.

Mechanism hypothesis: Be lighter, higher phonon freq, less stable

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: lighter, higher freq estimate

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: heavy hydride dimer route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: reduced-SOC chalcogenide comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: mixed-anion chalcogenide comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Parent topological-insulator host for [internal path] superconducting routes.

Prescreen-stage parent comparator retained as a bounded public research row; the superconducting context belongs to [internal path] or intercalated derivatives rather than stoichiometric Bi2Se3. This row is not a superconductivity claim for stoichiometric Bi2Se3. Any superconducting interpretation requires explicit doped or intercalated context.

Mechanism hypothesis: telluride chalcogenide comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: bismuth hydride high-pressure route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: chemical pressure tuning

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: cage-stabilized frontier route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: chemical pressure in diboride lane

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: calcium borocarbide framework tuning

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Parent infinite-layer cuprate comparator for explicitly tuned or interfacial superconducting routes.

Prescreen-stage parent comparator retained as a bounded public research row; any superconducting relevance belongs to explicitly doped or interfacial infinite-layer derivatives rather than stoichiometric CaCuO2 itself. This row is not a superconductivity claim for stoichiometric CaCuO2 and should not be presented as an already defined doped state.

Mechanism hypothesis: Pressure-sensitive 122 analog with strong structural response under tuning.

Prescreen-stage 122 comparator retained as a bounded public research row; any superconducting relevance depends on explicit pressure tuning or substitution context rather than ambient stoichiometric CaFe2As2 alone. This row is not an ambient superconductivity claim. Any superconducting interpretation requires explicit pressure or chemical-tuning context.

Mechanism hypothesis: Oxide comparator for perovskite-side structure-pressure effects.

Prescreen-stage oxide-side-branch comparator retained to test structural compression in the STO-like family. This is a DFT-screened exploratory record only; no bulk superconductivity claim is implied.

Mechanism hypothesis: high-profile heavy-fermion QCP superconductor

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: 115 family comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Cr magnetic risk high

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: K2NiF4-like silver fluoride comparator for nickelate-adjacent square-ligand physics.

Prescreen-stage square-ligand comparator retained as a bounded public research row; this row is meant to test nickelate-adjacent lattice logic, not to imply an established superconducting doping window. This row is not a validated superconductivity claim and should not be presented as an already defined doped state.

Mechanism hypothesis: magnetic kagome stress test

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: niobium kagome analog

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: tantalum kagome analog

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Bi-substituted kagome analog

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: magnetism coexistence borocarbide

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: [internal path] superconductivity route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: mixed-anion iron layer route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: phase-sensitive elemental superconductor

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: heavy diboride boundary comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Parent layered Hf-N-Cl host for the intercalated superconducting route.

Prescreen-stage parent comparator retained as a bounded public research row; the superconducting literature context belongs to [internal path] derivatives rather than stoichiometric HfNCl itself. This row is not a superconductivity claim for stoichiometric HfNCl. Any superconducting interpretation requires explicit intercalation or electron-doping context.

Mechanism hypothesis: historical first elemental superconductor

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: magnetism interplay borocarbide

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: elemental superconducting comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: potassium niobium kagome analog

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: SOC-relevant oxide-side benchmark within the dilute-carrier family.

Prescreen-stage KTaO3-derived oxide candidate retained for the low-density superconductivity side branch. This is a DFT-screened exploratory record only; relevant superconducting interpretations depend on explicit [internal path] conditions.

Mechanism hypothesis: La hole-doped nickelate variant

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: parent compound, AF insulator, doped->SC, d9 CuO2 plane

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: 4d comparator that helps test where the mainline loses the desired charge-transfer confinement because the bands become too wide.

Prescreen-stage 4d comparator retained as a boundary test for the single-orbital charge-transfer lane, not as a promoted superconducting claim. This record is a DFT-screened 4d stress-test analog only; it is included to keep the wider-band failure boundary visible, not because superconductivity is established.

Mechanism hypothesis: canonical interfacial superconductivity anchor

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: parent FeAs-layer baseline

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: explicit doped 1111 route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: lower-Tc phosphide comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: La infinite-layer nickelate parent comparator for the doped charge-transfer route.

Prescreen-stage parent nickelate comparator retained as a bounded public research row; any superconducting relevance belongs to explicitly doped infinite-layer derivatives rather than stoichiometric LaNiO2 itself. This row is not a superconductivity claim for stoichiometric LaNiO2 and should not be presented as an already defined doped state.

Mechanism hypothesis: 4d infinite-layer boundary comparator for the [internal path] mainline.

Prescreen-stage 4d infinite-layer comparator retained as a bounded charge-transfer boundary test, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; it is kept visible because it tests whether the 4d route loses the desired confinement too early.

Mechanism hypothesis: Al-Li-B sigma-band tuning route with lighter A-site chemistry

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Li-doped boride

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: alkali borohydride frontier route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: alkali borocarbide carrier tuning

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Al-Li-B ternary route probing sigma-band continuity beyond binary diborides

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: hole-doped MgB2-neighbor analog

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: late-stage sigma-band overfilling checkpoint against MgB2 mechanism

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: alloy electron count tuning

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: partial Al substitution as sigma-hole filling control knob

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: chemical-precompression hydride route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: magnesium borocarbide analog

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Mg+B+C framework

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: [internal path] boundary route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: alkali borocarbide charge donation

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: high-entropy superconducting motif search

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Nb-based MXene, predicted SC

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Primary mainline nickelate candidate for the 2D single-orbital charge-transfer route, with explicit parent-versus-doped semantics already encoded.

Prescreen-stage mainline candidate retained because it preserves explicit hole-doping and infinite-layer charge-transfer semantics rather than generic metallicity alone. This is a DFT-screened exploratory record only; the superconducting relevance here depends on the explicit Sr-doped infinite-layer nickelate context and is not a bulk Tc claim.

Mechanism hypothesis: Electron-doped cuprate parent comparator for explicitly tuned T'-phase routes.

Prescreen-stage parent comparator retained as a bounded public research row; any superconducting relevance belongs to electron-doped derivatives such as Nd2-xCexCuO4 rather than stoichiometric Nd2CuO4 itself. This row is not a superconductivity claim for stoichiometric Nd2CuO4 and should not be presented as an already defined doped state.

Mechanism hypothesis: Parent infinite-layer nickelate comparator for the main single-orbital route; should stay separated from the doped superconducting window.

Prescreen-stage parent nickelate comparator retained because it preserves the infinite-layer d9-adjacent lane and explicit charge-transfer framing. This is not a superconductivity claim for stoichiometric NdNiO2; it remains a DFT-screened parent comparator whose value is mainly in keeping the nickelate mainline explicit.

Mechanism hypothesis: Pb mixed valence

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: heavy p-block hydride under pressure

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Pb-O, interface SC candidate

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: lead chalcogenide comparator

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: topological, pressure-induced SC

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Pr hole-doped nickelate variant

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Rare-earth control branch for the nickelate mainline; useful only if kept explicit as a comparator rather than merged into a generic nickel oxide row.

Prescreen-stage rare-earth comparator retained to probe how the nickelate mainline shifts under rare-earth substitution while preserving infinite-layer semantics. This is a DFT-screened comparator only and should not be read as a verified superconducting claim for stoichiometric PrNiO2.

Mechanism hypothesis: higher-Tc actinide heavy-fermion boundary

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: rubidium niobium kagome analog

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Rb version

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: ternary cage hydride route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: antimony hydride high-pressure route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: d-metal A-site, extra electron, possible sigma enhancement

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: lower-pressure-target ternary hydride

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: p-block hydride under pressure

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: intercalated chalcogenide route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Infinite-layer cuprate parent comparator for explicitly doped charge-transfer routes.

Prescreen-stage parent comparator retained as a bounded public research row; any superconducting relevance belongs to explicitly doped infinite-layer cuprate variants rather than stoichiometric SrCuO2 itself. This row is not a superconductivity claim for stoichiometric SrCuO2 and should not be presented as an already defined doped state.

Mechanism hypothesis: A-site tuning in 122 family

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Useful oxide side branch for low-density superconductivity benchmarking rather than a room-temperature mainline claim.

Prescreen-stage oxide-side-branch candidate kept for the dilute-carrier / ferroelectric-proximity route. This is a DFT-screened exploratory record only; superconducting relevance depends on dilute doping / vacancy context rather than stoichiometric bulk SrTiO3.

Mechanism hypothesis: tellurium hydride pressure route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Ti thin MXene

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: 2D metallic MXene

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Ti-C-N mixed

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: TiC Tc~3K

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: high-entropy nitride frontier route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: reduced TiO2-x

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: multi-principal diboride frontier route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: multi-component heavy-fermion superconductor

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: spin-triplet heavy-fermion candidate

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: V-based MXene

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: d-metal, half-filled d-band, check magnetism

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: heavy-boride frontier route

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: W boride

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: WC Tc~10K? check literature

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: doped W bronze

Prescreen-stage SC SuperLoop exploratory candidate retained as a bounded public research row, not as a confirmed superconductivity claim. This is a DFT-screened exploratory record only; public visibility does not imply a validated Tc claim.

Mechanism hypothesis: Parent layered Zr-N-Cl host for the intercalated superconducting route.

Prescreen-stage parent comparator retained as a bounded public research row; the superconducting literature context belongs to [internal path] derivatives rather than stoichiometric ZrNCl itself. This row is not a superconductivity claim for stoichiometric ZrNCl. Any superconducting interpretation requires explicit intercalation or electron-doping context.

Mechanism hypothesis: Current DOS(E_F) remains under review rather than a clean conventional-metal confirmation.

Loop-verified exploratory diboride lane with completed fixed-cell QE chain. Multiple MoB2 phases exist in literature; present record is limited to the reviewed loop proxy outcome.

Mechanism hypothesis: Finite DOS at E_F survives the repaired [internal path] path, but structural minimum remains unverified in the present setup.

Loop-verified fixed-cell metallic diboride candidate; not a Tc claim. Current free-cell and EOS follow-ups remain unresolved, so this stays below phonon promotion.

Mechanism hypothesis: Useful negative-control style evidence for the present proxy family.

Loop-verified exploratory diboride lane with completed fixed-cell QE chain. Current fixed-cell AlB2-type path yields near-zero DOS(E_F); this is a review-only outcome, not a phonon-ready hit.

Mechanism hypothesis: Useful reviewed endpoint for the same proxy family that contains other negative metallic outcomes.

Loop-verified exploratory diboride lane with completed fixed-cell QE chain. Current fixed-cell DOS(E_F) is near zero; retained as reviewed queue evidence, not as a phonon-ready hit.

Mechanism hypothesis: Evidence is useful for family-level calibration even though the present proxy outcome is not positive.

Loop-verified exploratory diboride lane with bounded fixed-cell QE chain. Current fixed-cell DOS(E_F) is effectively zero; retained as a reviewed DFT-screened record rather than a metallic promotion.