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  • Letter
  • Open Access

Anomalous thermoelectric effects and quantum oscillations in the kagome metal CsV3Sb5

Dong Chen1,2,*, Bin He1, Mengyu Yao1, Yu Pan1, Haicheng Lin1, Walter Schnelle1, Yan Sun1, Johannes Gooth1, Louis Taillefer3,4 et al.

Claudia Felser1,4,†

  • 1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
  • 2College of Physics, Qingdao University, Qingdao 266071, China
  • 3Institut Quantique, Département de Physique and RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada
  • 4Canadian Institute for Advanced Research, Toronto, Ontario, Canada

  • *Dong.Chen@cpfs.mpg.de
  • †Claudia.Felser@cpfs.mpg.de
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Phys. Rev. B 105, L201109 – Published 16 May, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L201109

Abstract

The kagome metal compounds AV3Sb5 (A=K, Rb, and Cs) feature a wealth of phenomena including nontrivial band topology, charge density wave (CDW), and superconductivity. One intriguing property is the time-reversal symmetry breaking in the CDW state without local moments, which leads to anomalous transport responses. Here, we report the investigation of magnetothermoelectric effects on high-quality CsV3Sb5 single crystals. A large anomalous Nernst effect (ANE) is observed at temperatures below 30 K and can be enhanced by the high mobility. Multiple Fermi surfaces with small effective masses are revealed by quantum oscillations in the Nernst and Seebeck signals. Furthermore, we discover a magnetic breakdown effect across the two smallest Fermi surfaces, with a gap around 20 meV between them. We propose that the two Fermi surfaces are split from a Dirac band by the CDW gap. These results indicate the large ANE originates from the CDW modulated nontrivial band structure as well as the extrinsic contributions. A second phase transition below the CDW transition temperature is also suggested by the strange temperature dependence of the ANE.

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Outline

Information

Phys. Rev. B 105, L201109– Published 16 May, 2022
  • Received 4 November 2021
  • Revised 23 April 2022
  • Accepted 2 May 2022
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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