Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 39: Correlated Electrons: Charge Order

TT 39.4: Vortrag

Freitag, 9. September 2022, 12:00–12:15, H23

High-pressure IR investigations unveil modifications in the electronic structure of the superconducting Kagome metal CsV₃Sb₅ — •Maxim Wenzel¹, Yuk T. Chan¹, Brenden R. Ortiz^{2, 3}, Stephen D. Wilson³, Martin Dressel¹, Alexander A. Tsirlin⁴, and Ece Uykur¹ — ¹1. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany — ²California Nanosystems Institute, University of California Santa Barbara, Santa Barbara, CA, 93106, United States — ³Materials Department, University of California Santa Barbara, Santa Barbara, CA, 93106, United States — ⁴Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany

The non-magnetic Kagome metal series AV₃Sb₅ with A = K, Cs, or Rb is known for the coexistence of charge-density-wave and superconducting orders at low temperatures. Previously, the tunability of both orders has been investigated extensively via high-pressure transport studies; however, the pressure-induced modifications of the electronic band structure, especially the position of the saddle points, remain the subject of current research. While theoretical studies present conflicting suggestions regarding the pressure effects on the band structure, it has been shown that the interband optical transitions are highly sensitive to the position of the saddle points and hence, can probe them experimentally. Therefore, we performed high-pressure infrared studies on the model compound CsV₃Sb₅ at room temperature to trace the behavior of the interband optical transitions up to 17 GPa.