Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5

Yigui Zhong, Shaozhi Li, Hongxiong Liu, Yuyang Dong, Kohei Aido, Yosuke Arai, Haoxiang Li, Weilu Zhang, Youguo Shi, Ziqiang Wang, Shik Shin, H. N. Lee, H. Miao (), Takeshi Kondo () and Kozo Okazaki ()
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Yigui Zhong: The University of Tokyo
Shaozhi Li: Oak Ridge National Laboratory
Hongxiong Liu: Chinese Academy of Sciences
Yuyang Dong: The University of Tokyo
Kohei Aido: The University of Tokyo
Yosuke Arai: The University of Tokyo
Haoxiang Li: Oak Ridge National Laboratory
Weilu Zhang: The University of Tokyo
Youguo Shi: Chinese Academy of Sciences
Ziqiang Wang: Boston College
Shik Shin: The University of Tokyo
H. N. Lee: Oak Ridge National Laboratory
H. Miao: Oak Ridge National Laboratory
Takeshi Kondo: The University of Tokyo
Kozo Okazaki: The University of Tokyo

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in a new kagome metal CsV3Sb5, superconductivity that possibly intertwines with time-reversal and spatial symmetry-breaking orders is observed. Density functional theory calculations predicted weak EPC strength, λ, supporting an unconventional pairing mechanism in CsV3Sb5. However, experimental determination of λ is still missing, hindering a microscopic understanding of the intertwined ground state of CsV3Sb5. Here, using 7-eV laser-based angle-resolved photoemission spectroscopy and Eliashberg function analysis, we determine an intermediate λ=0.45–0.6 at T = 6 K for both Sb 5p and V 3d electronic bands, which can support a conventional superconducting transition temperature on the same magnitude of experimental value in CsV3Sb5. Remarkably, the EPC on the V 3d-band enhances to λ~0.75 as the superconducting transition temperature elevated to 4.4 K in Cs(V0.93Nb0.07)3Sb5. Our results provide an important clue to understand the pairing mechanism in the kagome superconductor CsV3Sb5.

Date: 2023
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DOI: 10.1038/s41467-023-37605-7

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