Evidence of a distinct collective mode in Kagome superconductors

Bin Hu, Hui Chen, Yuhan Ye, Zihao Huang, Xianghe Han, Zhen Zhao, Hongqin Xiao, Xiao Lin, Haitao Yang, Ziqiang Wang () and Hong-Jun Gao ()
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Bin Hu: Chinese Academy of Sciences
Hui Chen: Chinese Academy of Sciences
Yuhan Ye: Chinese Academy of Sciences
Zihao Huang: Chinese Academy of Sciences
Xianghe Han: Chinese Academy of Sciences
Zhen Zhao: Chinese Academy of Sciences
Hongqin Xiao: Chinese Academy of Sciences
Xiao Lin: Chinese Academy of Sciences
Haitao Yang: Chinese Academy of Sciences
Ziqiang Wang: Boston College
Hong-Jun Gao: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract The collective modes of the superconducting order parameter fluctuation can provide key insights into the nature of the superconductor. Recently, a family of superconductors has emerged in non-magnetic kagome materials AV3Sb5 (A = K, Rb, Cs), exhibiting fertile emergent phenomenology. However, the collective behaviors of Cooper pairs have not been studied. Here, we report a distinct collective mode in CsV3-xTaxSb5 using scanning tunneling microscope/spectroscopy. The spectral line-shape is well-described by one isotropic and one anisotropic superconducting gap, and a bosonic mode due to electron-mode coupling. With increasing x, the two gaps move closer in energy, merge into two isotropic gaps of equal amplitude, and then increase synchronously. The mode energy decreases monotonically to well below $${{2}}{{\Delta }}$$ 2 Δ and survives even after the charge density wave order is suppressed. We propose the interpretation of this collective mode as Leggett mode between different superconducting components or the Bardasis-Schrieffer mode due to a subleading superconducting component.

Date: 2024
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DOI: 10.1038/s41467-024-50330-z

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