Anomalous enhancement of charge density wave in kagome superconductor CsV₃Sb₅ approaching the 2D limit.

ABSTRACT: The recently discovered kagome metals AV₃Sb₅ (A = Cs, Rb, K) exhibit a variety of intriguing phenomena, such as a charge density wave (CDW) with time-reversal symmetry breaking and possible unconventional superconductivity. Here, we report a rare non-monotonic evolution of the CDW temperature (T_CDW) with the reduction of flake thickness approaching the atomic limit, and the superconducting transition temperature (T_c) features an inverse variation with T_CDW. T_CDW initially decreases to a minimum value of 72 K at 27 layers and then increases abruptly, reaching a record-high value of 120 K at 5 layers. Raman scattering measurements reveal a weakened electron-phonon coupling with the reduction of sample thickness, suggesting tha

SUBMITTER: Song B 

PROVIDER: S-EPMC10148882 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature