Anomalous thermoelectric effects and quantum oscillations in the kagome metal CsV3Sb5

Chen D, He B, Yao M, Pan Y, Lin H, Schnelle W, Sun Y, Gooth J, Taillefer L, Felser C (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Physical Review B American Physical Society

Book Volume: 105

Article Number: L201109

Journal Issue: 20

DOI: 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.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Université de Sherbrooke CA Canada (CA)

How to cite

APA:

Chen, D., He, B., Yao, M., Pan, Y., Lin, H., Schnelle, W.,... Felser, C. (2022). Anomalous thermoelectric effects and quantum oscillations in the kagome metal CsV3Sb5. Physical Review B, 105(20). https://doi.org/10.1103/PhysRevB.105.L201109

MLA:

Chen, Dong, et al. "Anomalous thermoelectric effects and quantum oscillations in the kagome metal CsV3Sb5." Physical Review B 105.20 (2022).

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