Colossal c-axis response and lack of rotational symmetry breaking within the kagome plane of the CsV<sub>3</sub>Sb<sub>5</sub> superconductor
ORAL
Abstract
The kagome materials AV3Sb5 (A = K, Rb, Cs) host an intriguing interplay between unconventional superconductivity and charge-density-waves. Here, we investigate CsV3Sb5 by combining high-resolution thermal-expansion, heat-capacity and electrical resistance under strain measurements. We show that the superconducting and charge-ordered states strongly compete, and that this competition is dramatically influenced by tuning the crystallographic c-axis. Furthermore, we report the absence of additional bulk phase transitions within the charge-ordered state, notably associated with rotational symmetry-breaking within the kagome planes. This suggests that any breaking of the C6 invariance occurs via different stacking of C6-symmetric kagome patterns. Finally, we find that the charge-density-wave phase exhibits an enhanced A1g-symmetric elastoresistance coefficient, whose large increase at low temperature is driven by electronic degrees of freedom.
*Work at KIT was partially funded by the Deutsche Forschungsgemeinschaft (DFG, Ger- man Research Foundation) TRR 288-422213477 (Projects A02 and B03) and Chinesisch-Deutsche Mobilit ̈atsprogamm of Chinesisch-Deutsche Zentrum fu ̈r Wissenschaftsfo ̈rderung (Grant No. M-0496). M.F acknowledges funding by the Alexander von Humboldt fundation and the Young Investigator preparation program of the Karlsruhe Institute of Technology. Y. G. acknowledges the support by the National Natural Science Foundation of China (Grant No. 920651). W. X. thanks the support by the Shanghai Sailing Program (23YF1426900).
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Publication: https://arxiv.org/abs/2310.06102
Presenters
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Frederic Hardy
- Karlsruhe Institute of Technology
- Institut für QuantenMaterialien und Technologien, Karlsruhe Institute of Technology