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Lattice-shifted nematic quantum critical point in FeSe1−xSx

Chibani, S.; Farina, D.; Massat, P.; Cazayous, M.; Sacuto, A.; Urata, T.; Tanabe, Y.; Tanigaki, K.; Böhmer, A. E.; Canfield, P. C.; Merz, M.; Karlsson, S.; Strobel, P.; Toulemonde, P.; Paul, I.; Gallais, Y.

Abstract (englisch):
We report the evolution of nematic fluctuations in FeSe1−xSx single crystals as a function of Sulfur content x across the nematic
quantum critical point (QCP) xc ~ 0.17 via Raman scattering. The Raman spectra in the B1g nematic channel consist of two
components, but only the low energy one displays clear fingerprints of critical behavior and is attributed to itinerant carriers.
Curie–Weiss analysis of the associated nematic susceptibility indicates a substantial effect of nemato-elastic coupling, which shifts
the location of the nematic QCP. We argue that this lattice-induced shift likely explains the absence of any enhancement of the
superconducting transition temperature at the QCP. The presence of two components in the nematic fluctuations spectrum is
attributed to the dual aspect of electronic degrees of freedom in Hund’s metals, with both itinerant carriers and local moments
contributing to the nematic susceptibility.

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Verlagsausgabe §
DOI: 10.5445/IR/1000131696
Veröffentlicht am 21.04.2021
Originalveröffentlichung
DOI: 10.1038/s41535-021-00336-3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 04.2021
Sprache Englisch
Identifikator ISSN: 2397-4648
KITopen-ID: 1000131696
Erschienen in npj quantum materials
Verlag Nature Research
Band 6
Heft 1
Seiten 37
Vorab online veröffentlicht am 12.04.2021
Nachgewiesen in Scopus
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