中国物理B ›› 2026, Vol. 35 ›› Issue (2): 27401-027401.doi: 10.1088/1674-1056/ae23ae

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Pressure-induced superconductivity in kagome metal CsCr3Sb5: Role of spin-orbit coupling and inter-orbital spin fluctuations

Wei Wang(王巍)1,2, Shun-Li Yu(于顺利)3,4,†, and Jian-Xin Li(李建新)3,4,‡   

  1. 1 School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
    2 Jiangsu Physical Science Research Center, Nanjing 210093, China;
    3 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;
    4 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 收稿日期:2025-09-23 修回日期:2025-11-22 接受日期:2025-11-25 发布日期:2026-01-27
  • 通讯作者: Shun-Li Yu, Jian-Xin Li E-mail:slyu@nju.edu.cn;jxli@nju.edu.cn
  • 基金资助:
    This work was supported by the National Key Research and Development of China (Grant Nos. 2024YFA1408104 and 2021YFA1400400), the National Natural Science Foundation of China (Grant Nos. 12374137, 12434005, 12074175, 92165205, 12004191, and 12550405), and the Natural Science Foundation of Jiangsu Province (Grant No. BK20233001).

Pressure-induced superconductivity in kagome metal CsCr3Sb5: Role of spin-orbit coupling and inter-orbital spin fluctuations

Wei Wang(王巍)1,2, Shun-Li Yu(于顺利)3,4,†, and Jian-Xin Li(李建新)3,4,‡   

  1. 1 School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
    2 Jiangsu Physical Science Research Center, Nanjing 210093, China;
    3 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;
    4 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • Received:2025-09-23 Revised:2025-11-22 Accepted:2025-11-25 Published:2026-01-27
  • Contact: Shun-Li Yu, Jian-Xin Li E-mail:slyu@nju.edu.cn;jxli@nju.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development of China (Grant Nos. 2024YFA1408104 and 2021YFA1400400), the National Natural Science Foundation of China (Grant Nos. 12374137, 12434005, 12074175, 92165205, 12004191, and 12550405), and the Natural Science Foundation of Jiangsu Province (Grant No. BK20233001).

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摘要： Motivated by the recent discovery of superconductivity in the kagome metal CsCr$_3$Sb$_5$ under pressure, we theoretically investigate the superconducting pairing symmetry and the impact of spin-orbit coupling (SOC) in this system. By employing an effective four-orbital tight-binding model and solving the linearized gap equation within the random phase approximation, we find that the large inter-orbital spin fluctuations enhanced by Hund's coupling promote a superconducting gap function with $E_{2g}$ symmetry. The inclusion of SOC further stabilizes this gap symmetry. Our analysis also reveals that the dx2-y2 orbital plays the dominant role in forming the superconducting pairs.

关键词: kagome lattice, CsCr$_3$Sb$_5$, superconductivity, spin-orbit coupling

Abstract: Motivated by the recent discovery of superconductivity in the kagome metal CsCr$_3$Sb$_5$ under pressure, we theoretically investigate the superconducting pairing symmetry and the impact of spin-orbit coupling (SOC) in this system. By employing an effective four-orbital tight-binding model and solving the linearized gap equation within the random phase approximation, we find that the large inter-orbital spin fluctuations enhanced by Hund's coupling promote a superconducting gap function with $E_{2g}$ symmetry. The inclusion of SOC further stabilizes this gap symmetry. Our analysis also reveals that the dx2-y2 orbital plays the dominant role in forming the superconducting pairs.

Key words: kagome lattice, CsCr$_3$Sb$_5$, superconductivity, spin-orbit coupling

中图分类号:  (Pairing symmetries (other than s-wave))

  • 74.20.Rp
75.10.Lp (Band and itinerant models) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect) 71.10.Fd (Lattice fermion models (Hubbard model, etc.))