SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Kagome Systems
TT 23.3: Vortrag
Dienstag, 28. März 2023, 10:00–10:15, HSZ 304
Investigation of the charge density wave in single crystal CsV3Sb5 under hydrostatic pressure — •Fabian Stier1, Tobias Ritschel1, Marein Rahn1, Chandra Shekhar2, Claudia Felser2, and Jochen Geck1 — 1IFMP, TU Dresden, Germany — 2MPI CPfS, Dresden, Germany
The topological Z2 kagome materials AV3Sb5 (A = K, Rb, Cs) show a nontrivial electronic topology, exhibit superconductivity (SC) and a charge-density-wave (CDW) order. CsV3Sb5 shows a CDW below 90K with a 2x2x4 superstructure, which changes around 60K to a 2x2x2 superstructure. To investigate the interplay of CDW-order and SC we performed single crystal x-ray diffraction under hydrostatic pressure, with Argon as a pressure medium, up to 2 GPa and 20K. In this pressure range the SC shows two distinct domes, where Tc is enhanced and shows two maxima. The 2x2x2 CDW at low temperatues persists under pressure up to the first extremum of Tc ∼ 0.7 GPa, where for a short pressure range both, the CDW and a new emerging incommensurate CDW coexists. While the first CDW quickly vanishes, the incommensurate CDW persists up to pressures where the SC shows another extremum in Tc. Above this pressure, ∼ 1.5GPa, no CDW could be detected. An accurate knowledge of these structural modifications will be essential to explain the relationship of topology and superconductivity in this class of materials.