{"schemaVersion":"1.0","revision":"414f1e850a9ed04cee70","note":{"id":"dean-lsco-magnetic-excitations","title":"LSCO magnetic excitations: persistence within a measured window","summary":"Follow the momentum range, linewidth and intensity corrections before drawing a conclusion about superconducting pairing.","kind":"research-note-and-cross-topic-analysis","modifiedAt":"2026-10-19T00:30:35.081659+00:00","aliases":["Dean","Bozovic","paramagnon","magnetic excitations","RIXS","LSCO magnetism","磁激发"],"evidenceTypes":["experiment"],"relatedCodes":["B3","D3","A5","D11"],"review":{"checkedAt":"2026-10-19","scope":"Selected journal text, Figure 3 and supplementary fitting, normalization and spectral-weight sections. The sample-thickness discrepancy remains unresolved.","limitations":["Author self-review; no independent scientific acceptance or raw-data refitting.","The journal main text and supplementary Table I disagree on two sample thicknesses. No silent reconciliation is applied.","Study 3 adds limited coverage to studies 2, 5 and 9; six inherited series studies remain pending."]},"sections":[{"id":"momentum-window","title":"Persistence has a momentum window","markdown":"Dean and colleagues find broadened magnetic excitations in LSCO up to $x=0.40$. Their reported fitted window is $\\mathbf Q=(0.18\\text{–}0.40,0)$ in reciprocal lattice units. It complements neutron measurements near $(0.5,0.5)$. Similar dispersion and comparable integrated intensity in this window do not establish conservation across the whole Brillouin zone.","evidenceType":"experiment","sourceIds":["dean-journal"],"sourceRelationship":"direct-support"},{"id":"normalization","title":"Widths and intensities need their corrections","markdown":"The resolution is 130 meV **HWHM**, not FWHM. Fits include a thermal factor and resolution convolution. Unresolved phonon/multispin scattering contributes an estimated 15% overestimate to width and intensity. Supplementary intensity corrections include a changed incident flux and a 0.78 factor for the nominally thicker films; instrumental instability enters the uncertainty.","evidenceType":"experiment","sourceIds":["dean-journal","dean-supplement"],"sourceRelationship":"direct-support"},{"id":"thickness-discrepancy","title":"An unresolved sample-thickness discrepancy","markdown":"The main-text grouping assigns approximately 53 nm to $x=0.16$ and 99 nm to $x=0.26$. Supplementary Table I instead lists $97\\pm3$ nm and $52\\pm3$ nm, respectively. The normalization discussion follows the former grouping. These records are not reconciled here; the corrected intensities have not been independently reproduced.","evidenceType":"experiment","sourceIds":["dean-journal","dean-supplement"],"sourceRelationship":"direct-support"},{"id":"model-extrapolation","title":"What the spectral-fraction estimate assumes","markdown":"The quoted 27% spectral fraction comes from an undoped spin-wave calculation. Extending its persistence with doping assumes comparable scaling along an unmeasured diagonal direction.","evidenceType":"experiment","sourceIds":["dean-supplement"],"sourceRelationship":"direct-support"},{"id":"interpretation","title":"Use spectral evidence to constrain a pairing model","markdown":"Editorially, persistence of an excitation is one constraint on a pairing theory. It cannot by itself select a unique interaction or explain the transition temperature. Compare the relevant momentum, energy and sample conditions, rather than treating an integrated signal as a complete pairing kernel.","evidenceType":"experiment","sourceIds":["dean-supplement"],"sourceRelationship":"context-for-editorial-analysis"},{"id":"series-coverage","title":"Coverage within the inherited research series","markdown":"This note covers study 3. [Interface localization](/scwiki/library/cuprate-interface-layer-order) covers studies 2 and 9; [THz conductivity](/scwiki/library/bilbro-thz-fluctuation-window) covers study 5. Six studies and additional cross-topic comparisons remain pending.\n\nEach source keeps its own uncertainty and access limits. The source-note merge remains partial; a linked paper does not mean every claim has been independently reviewed.","evidenceType":"experiment","sourceIds":[],"sourceRelationship":"context-for-editorial-analysis"}],"sources":[{"id":"dean-journal","title":"Persistence of magnetic excitations in La2−xSrxCuO4 from the undoped insulator to the heavily overdoped non-superconducting metal","authors":"M. P. M. Dean and colleagues","url":"https://markdean.info/assets/pdf/dean2013persistence.pdf","publicationStatus":"journal-article","date":"2013-08-04","dateLabel":"Published online","version":"Nature Materials 12, 1019–1023 (2013), journal-formatted PDF hosted by the author","checkedAt":"2026-10-19","scope":"Selected pages 1–4; Figure 3 inspected. Raw data not refitted.","doi":"10.1038/nmat3723","licenseUrl":null,"licenseLabel":null},{"id":"dean-supplement","title":"Supplementary Information to Persistence of magnetic excitations in LSCO","authors":"M. P. M. Dean and colleagues","url":"https://markdean.info/assets/pdf/dean2013persistence_supp.pdf","publicationStatus":"journal-article","date":"2013-08-04","dateLabel":"Associated article published online","version":"Journal Supplementary Information, author-hosted 14-page PDF","checkedAt":"2026-10-19","scope":"Selected pages 6 and 9–12; pixels 6, 10 and 12 inspected. Thickness discrepancy unresolved.","doi":"10.1038/nmat3723","licenseUrl":null,"licenseLabel":null}],"provenance":[{"path":"papers/CROSS_D3_D11_BozovicInterface.md","commit":"0a7c9d6696804ec26aa12f8eed68b55c9b3c0fcf","sha256":"8f299055adac85ea95c5dca9a35c6939305162fa1c0f36e4a8f6d58211a7be83","disposition":"partial-merge","coverage":"Dean magnetic-excitation comparison only. Other interface and THz evidence has separate notes; remaining CROSS claims require review.","repository":"JackZH26/jzis-superconductivity"},{"path":"papers/library/Bozovic_Cuprate-Interface-Series_READING_NOTES.md","commit":"0a7c9d6696804ec26aa12f8eed68b55c9b3c0fcf","sha256":"6c0b3484dbfe9831b95e8f1ad578c2889e9c88b5e25c6954bb09160df741f0ee","disposition":"partial-merge","coverage":"Study section 3: Dean magnetic excitations only. Other study coverage is documented separately; six series studies remain pending.","repository":"JackZH26/jzis-superconductivity"}],"corrections":[{"issue":"Coverage of the measurement","inherited":"Persistence can be read as conservation of the full magnetic spectrum.","resolution":"Retain the measured momentum window and the assumptions behind extrapolation."},{"issue":"Confidence in intensity comparison","inherited":"A brief summary omits calibration and sample-record limitations.","resolution":"Keep normalization uncertainty and the unresolved primary-source discrepancy visible."}],"rights":"Original concise synthesis and editorial analysis. The PDFs retain a publisher copyright notice; no open reuse license is asserted and no paper figures are reproduced.","revision":"b388fdbf09cd08339b08"}}