Pressure evolution of electron dynamics in the superconducting kagome metal CsV<subscript>3</subscript>Sb<subscript>5</subscript>.
In: NPJ Quantum Materials, Jg. 8 (2023-09-01), Heft 1, S. 1-7
Online
academicJournal
Zugriff:
The coexistence of the charge-density wave (CDW) and superconducting phases and their tunability under external pressure remains one of the key points in understanding the electronic structure of AV 3 Sb 5 (A = K, Rb, Cs) kagome metals. Here, we employ synchrotron-based infrared spectroscopy assisted by density-functional calculations to study the pressure evolution of the electronic structure at room temperature up to 17 GPa experimentally. The optical spectrum of CsV 3 Sb 5 is characterized by the presence of localized carriers seen as a broad peak at finite frequencies in addition to the conventional metallic Drude response. The non-monotonic pressure dependence of this low-energy peak reflects the re-entrant behavior of superconductivity and may be interpreted in terms of electron-phonon coupling, varying with the growth and shrinkage of the Fermi surface under pressure. Moreover, drastic modifications in the low-energy interband absorptions are observed upon the suppression of CDW. These changes are related to the upward shift of the Sb2 p x + p y band that eliminates part of the Fermi surface around the M-point, whereas band saddle points do not move significantly. These observations shed new light on the mixed electronic and lattice origin of the CDW in CsV 3 Sb 5 . [ABSTRACT FROM AUTHOR]
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Titel: |
Pressure evolution of electron dynamics in the superconducting kagome metal CsV<subscript>3</subscript>Sb<subscript>5</subscript>.
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Autor/in / Beteiligte Person: | Wenzel, Maxim ; Tsirlin, Alexander A. ; Capitani, Francesco ; Chan, Yuk T. ; Ortiz, Brenden R. ; Wilson, Stephen D. ; Dressel, Martin ; Uykur, Ece |
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Zeitschrift: | NPJ Quantum Materials, Jg. 8 (2023-09-01), Heft 1, S. 1-7 |
Veröffentlichung: | 2023 |
Medientyp: | academicJournal |
ISSN: | 2397-4648 (print) |
DOI: | 10.1038/s41535-023-00577-4 |
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