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TT: Fachverband Tiefe Temperaturen

TT 13: Kagome Systems

TT 13.1: Talk

Monday, March 18, 2024, 15:00–15:15, H 3010

Investigation of the charge density wave in single crystal CsV3Sb5 under hydrostatic pressureFabian Stier1, Amir Haghighirad3, Tobias Ritschel1, Chandra Shekhar2, Claudia Felser2, •Jochen Geck1, and Matthieu Le Tacon31IFMP, TU Dresden, Germany — 2MPI CPfS, Dresden, Germany — 3IQMT, KIT, Karlsruhe, Germany

The kagome materials AV3Sb5 (A = K, Rb, Cs) show a nontrivial electronic topology, exhibit unconventional superconductivity (SC) and charge-density-wave (CDW) order. We investigated the CDW in two different sample batches of CsV3Sb5 using x-ray diffraction as a function of hydrostatic pressure and temperature at the ID15B Beamline at the ESRF. Samples from both batches were loaded in the same diamond anvil cell (DAC) to ensure equal experimental conditions. Near ambient pressure, both sample batches exhibit the previously reported 2x2x2 and 2x2x4 CDW. The order in which these phases occur with decreasing temperature is reversed in one sample batch with respect to the other. Increasing the pressure at low temperature yields a new CDW order, which is the same in both batches. The critical pressures at which this new CDW phase appears and finally vanishes again, correspond well to the previously reported anomalies in the pressure dependence of the SC transition temperature. At low temperature and higher pressures the samples show another transient transition from the hexagonal unit cell to a monoclinic cell. Using our experimental results in combination with DFT calculations we will discuss the pressure effects on the electronic structure and the superconductivity.

Keywords: CsV3Sb5; CDW; High pressure

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