Superconductivity under pressure in a chromium-based kagome metal

Yi Liu, Zi-Yi Liu, Jin-Ke Bao, Peng-Tao Yang, Liang-Wen Ji, Si-Qi Wu, Qin-Xin Shen, Jun Luo, Jie Yang, Ji-Yong Liu, Chen-Chao Xu, Wu-Zhang Yang, Wan-Li Chai, Jia-Yi Lu, Chang-Chao Liu, Bo-Sen Wang, Hao Jiang, Qian Tao, Zhi Ren, Xiao-Feng Xu, Chao Cao, Zhu-An Xu, Rui Zhou (), Jin-Guang Cheng () and Guang-Han Cao ()
Additional contact information
Yi Liu: Zhejiang University
Zi-Yi Liu: Chinese Academy of Sciences
Jin-Ke Bao: Hangzhou Normal University
Peng-Tao Yang: Chinese Academy of Sciences
Liang-Wen Ji: Zhejiang University
Si-Qi Wu: Zhejiang University
Qin-Xin Shen: Chinese Academy of Sciences
Jun Luo: Chinese Academy of Sciences
Jie Yang: Chinese Academy of Sciences
Ji-Yong Liu: Zhejiang University
Chen-Chao Xu: Hangzhou Normal University
Wu-Zhang Yang: Westlake University
Wan-Li Chai: Zhejiang University
Jia-Yi Lu: Zhejiang University
Chang-Chao Liu: Zhejiang University
Bo-Sen Wang: Chinese Academy of Sciences
Hao Jiang: Xiangtan University
Qian Tao: Zhejiang University
Zhi Ren: Westlake University
Xiao-Feng Xu: Zhejiang University of Technology
Chao Cao: Zhejiang University
Zhu-An Xu: Zhejiang University
Rui Zhou: Chinese Academy of Sciences
Jin-Guang Cheng: Chinese Academy of Sciences
Guang-Han Cao: Zhejiang University

Nature, 2024, vol. 632, issue 8027, 1032-1037

Abstract: Abstract Superconductivity in a highly correlated kagome system has been theoretically proposed for years (refs. 1–5), yet the experimental realization is hard to achieve6,7. The recently discovered vanadium-based kagome materials8, which exhibit both superconductivity9–11 and charge-density-wave orders12–14, are nonmagnetic8,9 and weakly correlated15,16. Thus these materials are unlikely to host the exotic superconductivity theoretically proposed. Here we report the discovery of a chromium-based kagome metal, CsCr3Sb5, which is contrastingly featured with strong electron correlations, frustrated magnetism and characteristic flat bands close to the Fermi level. Under ambient pressure, this kagome metal undergoes a concurrent structural and magnetic phase transition at 55 K, with a stripe-like 4a0 structural modulation. At high pressure, the phase transition evolves into two transitions, possibly associated with charge-density-wave and antiferromagnetic spin-density-wave orderings. These density-wave-like orders are gradually suppressed with pressure and, remarkably, a superconducting dome emerges at 3.65–8.0 GPa. The maximum of the superconducting transition temperature, Tcmax = 6.4 K, appears when the density-wave-like orders are completely suppressed at 4.2 GPa, and the normal state exhibits a non-Fermi-liquid behaviour, reminiscent of unconventional superconductivity and quantum criticality in iron-based superconductors17,18. Our work offers an unprecedented platform for investigating superconductivity in correlated kagome systems.

Date: 2024
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DOI: 10.1038/s41586-024-07761-x

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