Nodeless electron pairing in CsV3Sb5-derived kagome superconductors

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 Suzuki, Kecheng Liu, Xinloong Han, Takeshi Kondo, Jiangping Hu, Shik Shin, Zhiwei Wang (), Xun Shi (), Yugui Yao and Kozo Okazaki ()
Additional contact information
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
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
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
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
Jiangping Hu: Chinese Academy of Sciences
Shik Shin: 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
Xun Shi: Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, 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
Kozo Okazaki: The University of Tokyo

Nature, 2023, vol. 617, issue 7961, 488-492

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41586-023-05907-x

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