Superconductivity emerged from density-wave order in a kagome bad metal
Superconductivity emerged from density-wave order in a kagome bad metal
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发表时间：
2023
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通讯作者：
Guang-Han Cao
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作者：
Yi Liu;Zi-Yi Liu;Jin-Ke Bao;Peng-Tao Yang;Liang-Wen Ji;Ji-Yong Liu;Chen-Chao Xu;Wu-Zhang Yang;Wan-Li Chai;Jia-Yi Lu;Chang-Chao Liu;Bo-Sen Wang;Hao Jiang;Qian Ta;Zhi Ren;Xiao-Feng Xu;Chao Cao;Zhu-An Xu;Jin-Guang Cheng;Guang-Han Cao
Unconventional superconductivity (USC) in a highly correlated kagome system has been theoretically proposed for years, yet the experimental realization is hard to achieve. The recently discovered vanadium-based kagome materials, which exhibit both superconductivity and charge density wave (CDW) orders, are nonmagnetic and weakly correlated, thus unlikely host USC as theories proposed. Here we report the discovery of a chromium-based kagome bad metal, CsCr3Sb5, which is contrastingly characterised by significant electron correlations and frustrated magnetism. Successive phase transitions at ∼54 K with stripe-like 4a0 structural modulations are observed, probably associated with CDW and antiferromagnetic spin-density-wave (SDW) orderings. Under moderately high pressures of 4-8 GPa, these density-wave orders are suppressed and, remarkably, superconductivity emerges with a maximum Tc of 6.4 K. A quantum critical point at Pc≈ 4 GPa is revealed, by which non-Fermi-liquid behaviours show up, reminiscent of USC in iron-based superconductors. The electronic structure calculations indicate that the electron filling is close to the characteristic flat bands of the kagome lattice. Our work offers an unprecedented platform for investigating the mechanism of USC in a correlated kagome system.
