Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 80: Correlated Electrons: Poster
TT 80.33: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster E
µm-beam LEED study of the charge density wave in the kagome metal CsV3Sb5 — •Lukas Jehn1, Felix Kurtz1, Alp Akbiyik1, Gevin von Witte2, Amir Haghighirad3, Dong Chen4, Chandra Shekhar4, Hannes Böckmann1, Matthieu Le Tacon3, Claudia Felser4, and Claus Ropers1,5 — 1Max Planck Institute for Multidisciplinary Sciences, D-37077 Göttingen — 2Department of Information Technology and Electrical Engineering, ETH Zürich, CH-8093 Zürich — 3Institute for Quantum Materials and Technologies, KIT, D-76344 Eggenstein-Leopoldshafen — 4Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden — 54th Physical Institute, University of Göttingen, D-37077 Göttingen
The discovery of the novel kagome metal CsV3Sb5 [1] sparked broad interest due to the coexistence of a charge density wave (CDW) phase and possible unconventional superconductivity [2]. We used low-energy electron diffraction (LEED) with a µm-sized electron beam [3] to study the structural CDW phase transition. We recorded high-quality backscattering diffraction patterns in ultrahigh vacuum from multiple cleaved samples. Surprisingly, we did not find superstructure reflexes at intensity levels predicted from dynamic LEED calculations based on the lattice distortion in the bulk. Therefore, we conclude that the periodic lattice distortion accompanying the CDW in CsV3Sb5 is less pronounced at surfaces than in the bulk.
[1] B. R. Ortiz et al., Phys. Rev. Mater. 3, 094407 (2019)
[2] B. R. Ortiz et al., Phys. Rev. Lett. 125, 247002 (2020)
[3] G. Storeck et al., Struct. Dyn. 4, 044024 (2017)