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A unique van Hove singularity in kagome superconductor CsV3-xTaxSb5 with enhanced superconductivity

Author

Listed:
  • Yang Luo

    (University of Science and Technology of China)

  • Yulei Han

    (Fuzhou University)

  • Jinjin Liu

    (Beijing Institute of Technology
    Beijing Institute of Technology)

  • Hui Chen

    (Chinese Academy of Sciences)

  • Zihao Huang

    (Chinese Academy of Sciences)

  • Linwei Huai

    (University of Science and Technology of China)

  • Hongyu Li

    (University of Science and Technology of China)

  • Bingqian Wang

    (University of Science and Technology of China)

  • Jianchang Shen

    (University of Science and Technology of China)

  • Shuhan Ding

    (University of Science and Technology of China)

  • Zeyu Li

    (University of Science and Technology of China)

  • Shuting Peng

    (University of Science and Technology of China)

  • Zhiyuan Wei

    (University of Science and Technology of China)

  • Yu Miao

    (University of Science and Technology of China)

  • Xiupeng Sun

    (University of Science and Technology of China)

  • Zhipeng Ou

    (University of Science and Technology of China)

  • Ziji Xiang

    (University of Science and Technology of China)

  • Makoto Hashimoto

    (SLAC National Accelerator Laboratory)

  • Donghui Lu

    (SLAC National Accelerator Laboratory)

  • Yugui Yao

    (Beijing Institute of Technology
    Beijing Institute of Technology)

  • Haitao Yang

    (Chinese Academy of Sciences)

  • Xianhui Chen

    (University of Science and Technology of China)

  • Hong-Jun Gao

    (Chinese Academy of Sciences)

  • Zhenhua Qiao

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Zhiwei Wang

    (Beijing Institute of Technology
    Beijing Institute of Technology
    Yangtze Delta Region Academy of Beijing Institute of Technology)

  • Junfeng He

    (University of Science and Technology of China)

Abstract

Van Hove singularity (VHS) has been considered as a driving source for unconventional superconductivity. A VHS in two-dimensional (2D) materials consists of a saddle point connecting electron-like and hole-like bands. In a rare case, when a VHS appears at Fermi level, both electron-like and hole-like conduction can coexist, giving rise to an enhanced density of states as well as an attractive component of Coulomb interaction for unconventional electronic pairing. However, this van Hove scenario is often destroyed by an incorrect chemical potential or competing instabilities. Here, by using angle-resolved photoemission measurements, we report the observation of a VHS perfectly aligned with the Fermi level in a kagome superconductor CsV3-xTaxSb5 (x ~ 0.4), in which a record-high superconducting transition temperature is achieved among all the current variants of AV3Sb5 (A = Cs, Rb, K) at ambient pressure. Doping dependent measurements reveal the important role of van Hove scenario in boosting superconductivity, and spectroscopic-imaging scanning tunneling microscopy measurements indicate a distinct superconducting state in this system.

Suggested Citation

  • Yang Luo & Yulei Han & Jinjin Liu & Hui Chen & Zihao Huang & Linwei Huai & Hongyu Li & Bingqian Wang & Jianchang Shen & Shuhan Ding & Zeyu Li & Shuting Peng & Zhiyuan Wei & Yu Miao & Xiupeng Sun & Zhi, 2023. "A unique van Hove singularity in kagome superconductor CsV3-xTaxSb5 with enhanced superconductivity," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39500-7
    DOI: 10.1038/s41467-023-39500-7
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