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Bulk evidence of anisotropic s-wave pairing with no sign change in the kagome superconductor CsV3Sb5

Author

Listed:
  • M. Roppongi

    (University of Tokyo)

  • K. Ishihara

    (University of Tokyo)

  • Y. Tanaka

    (University of Tokyo)

  • K. Ogawa

    (University of Tokyo)

  • K. Okada

    (University of Tokyo)

  • S. Liu

    (University of Tokyo)

  • K. Mukasa

    (University of Tokyo)

  • Y. Mizukami

    (University of Tokyo
    Tohoku University)

  • Y. Uwatoko

    (University of Tokyo)

  • R. Grasset

    (Institut Polytechnique de Paris)

  • M. Konczykowski

    (Institut Polytechnique de Paris)

  • B. R. Ortiz

    (University of California Santa Barbara)

  • S. D. Wilson

    (University of California Santa Barbara)

  • K. Hashimoto

    (University of Tokyo)

  • T. Shibauchi

    (University of Tokyo)

Abstract

The recently discovered kagome superconductors AV3Sb5 (A = K, Rb, Cs) exhibit unusual charge-density-wave (CDW) orders with time-reversal and rotational symmetry breaking. One of the most crucial unresolved issues is identifying the symmetry of the superconductivity that develops inside the CDW phase. Theory predicts a variety of unconventional superconducting symmetries with sign-changing and chiral order parameters. Experimentally, however, superconducting phase information in AV3Sb5 is still lacking. Here we report the impurity effects in CsV3Sb5 using electron irradiation as a phase-sensitive probe of superconductivity. Our magnetic penetration depth measurements reveal that with increasing impurities, an anisotropic fully-gapped state changes to an isotropic full-gap state without passing through a nodal state. Furthermore, transport measurements under pressure show that the double superconducting dome in the pressure-temperature phase diagram survives against sufficient impurities. These results support that CsV3Sb5 is a non-chiral, anisotropic s-wave superconductor with no sign change both at ambient and under pressure.

Suggested Citation

  • M. Roppongi & K. Ishihara & Y. Tanaka & K. Ogawa & K. Okada & S. Liu & K. Mukasa & Y. Mizukami & Y. Uwatoko & R. Grasset & M. Konczykowski & B. R. Ortiz & S. D. Wilson & K. Hashimoto & T. Shibauchi, 2023. "Bulk evidence of anisotropic s-wave pairing with no sign change in the kagome superconductor CsV3Sb5," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36273-x
    DOI: 10.1038/s41467-023-36273-x
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    2. Rina Tazai & Youichi Yamakawa & Hiroshi Kontani, 2023. "Charge-loop current order and Z3 nematicity mediated by bond order fluctuations in kagome metals," Nature Communications, Nature, vol. 14(1), pages 1-9, 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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