Nodeless electron pairing in CsV₃Sb₅-derived kagome superconductors

Yigui Zhong^#¹, Jinjin Liu^#^{2

3}, Xianxin Wu^#⁴, Zurab Guguchia⁵, J-X Yin^{6

7}, Akifumi Mine¹, Yongkai Li^{2

3

8}, Sahand Najafzadeh¹, Debarchan Das⁵, Charles Mielke 3rd⁵, Rustem Khasanov⁵, Hubertus Luetkens⁵, Takeshi Suzuki¹, Kecheng Liu¹, Xinloong Han⁹, Takeshi Kondo^{1

10}, Jiangping Hu¹¹, Shik Shin^{1

12}, Zhiwei Wang^{13

14

15}, Xun Shi^{16

17}, Yugui Yao^{2

3

8}, Kozo Okazaki^{18

19

20}

Affiliations

¹ Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan.
² Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China.
³ Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China.
⁴ CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, China.
⁵ Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland.
⁶ Laboratory for Quantum Emergence, Department of Physics, Southern University of Science and Technology, Shenzhen, China.
⁷ Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen, China.
⁸ Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, China.
⁹ Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing, China.
¹⁰ Trans-scale Quantum Science Institute, The University of Tokyo, Tokyo, Japan.
¹¹ Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.
¹² Office of University Professor, The University of Tokyo, Kashiwa, Japan.
¹³ Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China. zhiweiwang@bit.edu.cn.
¹⁴ Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China. zhiweiwang@bit.edu.cn.
¹⁵ Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, China. zhiweiwang@bit.edu.cn.
¹⁶ Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China. shixun@bit.edu.cn.
¹⁷ Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China. shixun@bit.edu.cn.
¹⁸ Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan. okazaki@issp.u-tokyo.ac.jp.
¹⁹ Trans-scale Quantum Science Institute, The University of Tokyo, Tokyo, Japan. okazaki@issp.u-tokyo.ac.jp.
²⁰ Material Innovation Research Center, The University of Tokyo, Kashiwa, Japan. okazaki@issp.u-tokyo.ac.jp.

^# Contributed equally.

PMID: 37100906
DOI: 10.1038/s41586-023-05907-x

Nodeless electron pairing in CsV₃Sb₅-derived kagome superconductors

Yigui Zhong et al. Nature. 2023 May.

. 2023 May;617(7961):488-492.

doi: 10.1038/s41586-023-05907-x. Epub 2023 Apr 26.

Authors

Affiliations

¹ Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan.
² Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China.
³ Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China.
⁴ CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, China.
⁵ Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland.
⁶ Laboratory for Quantum Emergence, Department of Physics, Southern University of Science and Technology, Shenzhen, China.
⁷ Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen, China.
⁸ Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, China.
⁹ Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing, China.
¹⁰ Trans-scale Quantum Science Institute, The University of Tokyo, Tokyo, Japan.
¹¹ Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.
¹² Office of University Professor, The University of Tokyo, Kashiwa, Japan.
¹³ Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China. zhiweiwang@bit.edu.cn.
¹⁴ Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China. zhiweiwang@bit.edu.cn.
¹⁵ Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, China. zhiweiwang@bit.edu.cn.
¹⁶ Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China. shixun@bit.edu.cn.
¹⁷ Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China. shixun@bit.edu.cn.
¹⁸ Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan. okazaki@issp.u-tokyo.ac.jp.
¹⁹ Trans-scale Quantum Science Institute, The University of Tokyo, Tokyo, Japan. okazaki@issp.u-tokyo.ac.jp.
²⁰ Material Innovation Research Center, The University of Tokyo, Kashiwa, Japan. okazaki@issp.u-tokyo.ac.jp.

^# Contributed equally.

PMID: 37100906
DOI: 10.1038/s41586-023-05907-x

Abstract

The newly discovered kagome superconductors represent a promising platform for investigating the interplay between band topology, electronic order and lattice geometry^1-9. Despite extensive research efforts on this system, the nature of the superconducting ground state remains elusive^10-17. In particular, consensus on the electron pairing symmetry has not been achieved so far^18-20, 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(V_0.93Nb_0.07)₃Sb₅ and Cs(V_0.86Ta_0.14)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.

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References

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1. Yu, S.-L. & Li, J.-X. Chiral superconducting phase and chiral spin-density-wave phase in a Hubbard model on the kagome lattice. Phys. Rev. B 85, 144402 (2012). - DOI
1. Kiesel, M. L., Platt, C. & Thomale, R. Unconventional Fermi surface instabilities in the kagome Hubbard model. Phys. Rev. Lett. 110, 126405 (2013). - PubMed - DOI
1. Wang, W.-S., Li, Z.-Z., Xiang, Y.-Y. & Wang, Q.-H. Competing electronic orders on kagome lattices at van Hove filling. Phys. Rev. B 87, 115135 (2013). - DOI
1. Ortiz, B. R. et al. New kagome prototype materials: discovery of KV₃Sb₅, RbV₃Sb₅, and CsV₃Sb₅. Phys. Rev. Mater. 3, 094407 (2019). - DOI

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Nodeless electron pairing in CsV₃Sb₅-derived kagome superconductors

Affiliations

Nodeless electron pairing in CsV₃Sb₅-derived kagome superconductors

Authors

Affiliations

Abstract

References

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