Colossal c-Axis Response and Lack of Rotational Symmetry Breaking within the Kagome Planes of the CsV3Sb5 Superconductor
Mehdi Frachet, Liran Wang, Wei Xia, Yanfeng Guo, Mingquan He, Nour Maraytta, Rolf Heid, Amir-Abbas Haghighirad, Michael Merz, Christoph Meingast, Frédéric Hardy
DOI 10.1103/PhysRevLett.132.186001 · Physical Review Letters
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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 directly unveil that the superconducting and charge-ordered states strongly compete, and that this competition is dramatically influenced by tuning the crystallographic c axis. In addition, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | unknown |
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