arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.14487cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
收藏

可果美钒基金属AV3Sb5(A = Rb和K)在压力下的双圆顶超导性

Double-dome superconductivity under pressure in the V-based Kagome metals AV3Sb5 (A = Rb and K)

C. C. Zhu, X. F. Yang, W. Xia, Q. W. Yin, L. S. Wang, C. C. Zhao, D. Z. Dai, C. P. Tu, B. Q. Song, Z. C. Tao, Z. J. Tu, C. S. Gong, H. C. Lei, Y. F. Guo, S. Y. Li

摘要:

我们提出了高压电输运测量新发现的V基超导体$A$ V $_3$ Sb $_5$($A$ = Rb和K),具有理想的Kagome晶格的钒。在两种化合物中均观察到压力下的两个超导圆顶,正如之前在其姊妹化合物CsV $_3$ Sb $_5$中观察到的那样。对于RbV $_3$ Sb $_5$,$T_c$从0.93 K(常压)增加到4.15 K(0.38 GPa)的最大值。第二个超导圆顶在28.8 GPa下具有最高的$T_c$,为1.57 K。KV $_3$ Sb $_5$显示类似的双圆顶相图,然而,其两个最大值$T_c$较低,并且$T_c$在第二圆顶中比RbV $_3$ Sb $_5$下降得更快。构建了$A$ V $_3$ Sb $_5$($A$ = Cs,Rb和K)的温度-压力积分相图,表明插层碱金属原子的离子半径具有显著的影响。我们的工作表明,压力下的双圆顶超导性是这些V基可果美金属的共同特征。

英文摘要:

We present high-pressure electrical transport measurements on the newly discovered V-based superconductors $A$V$_3$Sb$_5$ ($A$ = Rb and K), which have an ideal Kagome lattice of vanadium. Two superconducting domes under pressure are observed in both compounds, as previously observed in their sister compound CsV$_3$Sb$_5$. For RbV$_3$Sb$_5$, the $T_c$ increases from 0.93 K at ambient pressure to the maximum of 4.15 K at 0.38 GPa in the first dome. The second superconducting dome has the highest $T_c$ of 1.57 K at 28.8 GPa. KV$_3$Sb$_5$ displays a similar double-dome phase diagram, however, its two maximum $T_c$s are lower, and the $T_c$ drops faster in the second dome than RbV$_3$Sb$_5$. An integrated temperature-pressure phase diagram of $A$V$_3$Sb$_5$ ($A$ = Cs, Rb and K) is constructed, showing that the ionic radius of the intercalated alkali-metal atoms has a significant effect. Our work demonstrates that double-dome superconductivity under pressure is a common feature of these V-based Kagome metals.

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。

↑