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Nodeless electron pairing in CsV3Sb5-derived kagome superconductors

Author

Listed:
  • Yigui Zhong

    (The University of Tokyo)

  • Jinjin Liu

    (Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology
    Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology)

  • Xianxin Wu

    (CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences)

  • Zurab Guguchia

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • J.-X. Yin

    (Southern University of Science and Technology
    Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong))

  • Akifumi Mine

    (The University of Tokyo)

  • Yongkai Li

    (Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology
    Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology
    Yangtze Delta Region Academy of Beijing Institute of Technology)

  • Sahand Najafzadeh

    (The University of Tokyo)

  • Debarchan Das

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • Charles Mielke

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • Rustem Khasanov

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • Hubertus Luetkens

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • Takeshi Suzuki

    (The University of Tokyo)

  • Kecheng Liu

    (The University of Tokyo)

  • Xinloong Han

    (University of Chinese Academy of Sciences)

  • Takeshi Kondo

    (The University of Tokyo
    The University of Tokyo)

  • Jiangping Hu

    (Chinese Academy of Sciences)

  • Shik Shin

    (The University of Tokyo
    The University of Tokyo)

  • Zhiwei Wang

    (Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology
    Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology
    Yangtze Delta Region Academy of Beijing Institute of Technology)

  • Xun Shi

    (Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology
    Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology)

  • Yugui Yao

    (Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology
    Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology
    Yangtze Delta Region Academy of Beijing Institute of Technology)

  • Kozo Okazaki

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

Abstract

The newly discovered kagome superconductors represent a promising platform for investigating the interplay between band topology, electronic order and lattice geometry1–9. Despite extensive research efforts on this system, the nature of the superconducting ground state remains elusive10–17. In particular, consensus on the electron pairing symmetry has not been achieved so far18–20, in part owing to the lack of a momentum-resolved measurement of the superconducting gap structure. Here we report the direct observation of a nodeless, nearly isotropic and orbital-independent superconducting gap in the momentum space of two exemplary CsV3Sb5-derived kagome superconductors—Cs(V0.93Nb0.07)3Sb5 and Cs(V0.86Ta0.14)3Sb5—using ultrahigh-resolution and low-temperature angle-resolved photoemission spectroscopy. Remarkably, such a gap structure is robust to the appearance or absence of charge order in the normal state, tuned by isovalent Nb/Ta substitutions of V. Our comprehensive characterizations of the superconducting gap provide indispensable information on the electron pairing symmetry of kagome superconductors, and advance our understanding of the superconductivity and intertwined electronic orders in quantum materials.

Suggested Citation

  • Yigui Zhong & Jinjin Liu & Xianxin Wu & Zurab Guguchia & J.-X. Yin & Akifumi Mine & Yongkai Li & Sahand Najafzadeh & Debarchan Das & Charles Mielke & Rustem Khasanov & Hubertus Luetkens & Takeshi Suzu, 2023. "Nodeless electron pairing in CsV3Sb5-derived kagome superconductors," Nature, Nature, vol. 617(7961), pages 488-492, May.
    • Handle: RePEc:nat:nature:v:617:y:2023:i:7961:d:10.1038_s41586-023-05907-x
    DOI: 10.1038/s41586-023-05907-x
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    Cited by:

    1. J. N. Graham & C. Mielke III & D. Das & T. Morresi & V. Sazgari & A. Suter & T. Prokscha & H. Deng & R. Khasanov & S. D. Wilson & A. C. Salinas & M. M. Martins & Y. Zhong & K. Okazaki & Z. Wang & M. Z, 2024. "Depth-dependent study of time-reversal symmetry-breaking in the kagome superconductor AV3Sb5," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Honglie Ning & Kyoung Hun Oh & Yifan Su & Alexander Hoegen & Zach Porter & Andrea Capa Salinas & Quynh L. Nguyen & Matthieu Chollet & Takahiro Sato & Vincent Esposito & Matthias C. Hoffmann & Adam Whi, 2024. "Dynamical decoding of the competition between charge density waves in a kagome superconductor," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    3. Yaofeng Xie & Nathan Chalus & Zhiwei Wang & Weiliang Yao & Jinjin Liu & Yugui Yao & Jonathan S. White & Lisa M. DeBeer-Schmitt & Jia-Xin Yin & Pengcheng Dai & Morten Ring Eskildsen, 2024. "Conventional superconductivity in the doped kagome superconductor Cs(V0.86Ta0.14)3Sb5 from vortex lattice studies," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    4. Bin Hu & Hui Chen & Yuhan Ye & Zihao Huang & Xianghe Han & Zhen Zhao & Hongqin Xiao & Xiao Lin & Haitao Yang & Ziqiang Wang & Hong-Jun Gao, 2024. "Evidence of a distinct collective mode in Kagome superconductors," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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