arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.10959cond-mat.supr-con
收藏

可果美金属KV $_3$ Sb $_5$中电荷序与超导电性的相互作用

Interplay between charge order and superconductivity in the kagome metal KV$_3$Sb$_5$

Feng Du, Shuaishuai Luo, Brenden R. Ortiz, Ye Chen, Weiyin Duan, Dongting Zhang, Xin Lu, Stephen D. Wilson, Yu Song, Huiqiu Yuan

摘要:

kagome金属KV $_3$ Sb $_5$主机电荷顺序,拓扑非平凡的狄拉克带交叉,和超导基态与非常规特性,提供了一个理想的平台,以调查不同的电子状态之间的相互作用的kagome晶格。在这里,我们研究的电荷顺序和超导电性的KV $_3$锑$_5$在静水压力下的电阻率测量的演变。随着压力的施加,超导转变温度$T_{\rm c}=0.9$ K在环境压力下迅速增加到3.1 K在$p=0.4$ GPa,作为电荷顺序逐渐减弱。在进一步增加压力时,电荷有序的特征在$p_{\rm c1}\approx0.5$ GPa处消失,并且$T_{\rm c}$逐渐被抑制,形成超导圆顶,其终止于$p\approx10$ GPa。超过$p\approx10$ GPa,第二个超导圆顶出现,在$p_{\rm c2}\approx22$ GPa时具有最大的$T_{\rm c}\approx1.0$ K,在$p\approx28$ GPa时被完全抑制。第二个超导圆顶的超导性的抑制与一个独特的高压相的出现有关,可能是一个独特的电荷顺序。

英文摘要:

The kagome metal KV$_3$Sb$_5$ hosts charge order, topologically nontrivial Dirac band crossings, and a superconducting ground state with unconventional characteristics, providing an ideal platform to investigate the interplay between different electronic states on the kagome lattice. Here we study the evolution of charge order and superconductivity in KV$_3$Sb$_5$ under hydrostatic pressure using electrical resistivity measurements. With the application of pressure, the superconducting transition temperature $T_{\rm c}=0.9$ K under ambient pressure quickly increases to 3.1 K at $p=0.4$ GPa, as charge order progressively weakens. Upon further increasing pressure, signatures of charge order disappears at $p_{\rm c1}\approx0.5$ GPa and $T_{\rm c}$ is gradually suppressed, forming a superconducting dome that terminates at $p\approx10$ GPa. Beyond $p\approx10$ GPa, a second superconducting dome emerges with maximum $T_{\rm c}\approx1.0$ K at $p_{\rm c2}\approx22$ GPa, which becomes fully suppressed at $p\approx28$ GPa. The suppression of superconductivity for the second superconducting dome is associated with the appearance of a unique high-pressure phase , possibly a distinct charge order.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑