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

Author:

Zhong YiguiORCID,Li Shaozhi,Liu Hongxiong,Dong Yuyang,Aido Kohei,Arai Yosuke,Li Haoxiang,Zhang Weilu,Shi Youguo,Wang Ziqiang,Shin ShikORCID,Lee H. N.ORCID,Miao H.ORCID,Kondo TakeshiORCID,Okazaki KozoORCID

Abstract

AbstractIn 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 atT = 6 K for both Sb 5pand V 3delectronic 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.

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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