Double Superconducting Dome and Triple Enhancement of Tc in the Kagome Superconductor CsV3Sb5 under High Pressure
Double Superconducting Dome and Triple Enhancement of Tc in the Kagome Superconductor CsV3Sb5 under High Pressure
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Kagome超导CsV3Sb5的双超导穹顶和高压下T-c的三重增强
DOI：
10.1103/physrevlett.126.247001
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发表时间：
2021-06-17
影响因子：
8.6
通讯作者：
Cheng, J-G
中科院分区：
文献类型：
--
作者：
Chen, K. Y.;Wang, N. N.;Cheng, J-G
CsV 3Sb 5是一种新发现的Z（2）拓扑kagome金属，在常压下具有类电荷密度波（CDW）有序结构和超导性（SC）.在这里，我们研究的CDW和SC CsV 3Sb 5之间的相互作用，通过测量电阻率，直流和交流磁化率在各种压力下高达6.6 GPa。结果表明，CDW相变随压力的增加而减小，在P-c1约为0.6- 0.9GPa时，CDW相变有一个微小的变化，在P-ct 2约为GPa时，CDW相变完全消失。相应地，T_c（P）在P_（c1）和P_（c2）附近出现了一个不寻常的M形双圆顶，导致T_c在2GPa时增加了三倍，约为8 K。所得到的温度-压力相图类似于非常规超导体的温度-压力相图，说明类CDW有序和SC之间存在着激烈的竞争。这种竞争在中等压力范围P-c1时尤为强烈
CsV3Sb5 is a newly discovered Z(2) topological kagome metal showing the coexistence of a charge-density-wave (CDW)-like order at T* = 94 K and superconductivity (SC) at T-c = 2.5 K at ambient pressure. Here, we study the interplay between CDW and SC in CsV3Sb5 via measurements of resistivity, dc and ac magnetic susceptibility under various pressures up to 6.6 GPa. We find that the CDW transition decreases with pressure and experience a subtle modification at P-c1 approximate to 0.6-0.9 GPa before it vanishes completely at P-ct2 approximate to GPa. Correspondingly, T-c(P) displays an unusual M-shaped double dome with two maxima around P-c1 and P(c2 )respectively, leading to a tripled enhancement of T-c to about 8 K at 2 GPa. The obtained temperature-pressure phase diagram resembles those of unconventional superconductors, illustrating an intimated competition between CDW-like order and SC. The competition is found to be particularly strong for the intermediate pressure range P-c1