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

Author

Listed:
  • 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
    The Hong Kong University of Science and Technology (Guangzhou))

  • Weilu Zhang

    (The University of Tokyo
    Sophia University)

  • Youguo Shi

    (Chinese Academy of Sciences)

  • Ziqiang Wang

    (Boston College)

  • Shik Shin

    (The University of Tokyo
    Office of University Professor, The University of Tokyo)

  • H. N. Lee

    (Oak Ridge National Laboratory)

  • H. Miao

    (Oak Ridge National Laboratory)

  • Takeshi Kondo

    (The University of Tokyo
    The University of Tokyo)

  • Kozo Okazaki

    (The University of Tokyo
    The University of Tokyo
    The University of Tokyo)

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.

Suggested Citation

  • 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 & Kozo Okaza, 2023. "Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37605-7
    DOI: 10.1038/s41467-023-37605-7
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