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arXiv 2302.00844cond-mat.supr-concond-mat.mtrl-sci
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W $_{5}$ Si $_{3}$型高熵硅化物超导体

High-entropy silicide superconductors with W$_{5}$Si$_{3}$-type structure

Bin Liu, Wuzhang Yang, Guorui Xiao, Qinqing Zhu, Shijie Song, Guang-Han Cao, Zhi Ren

备注：
8 pages, 5 figures
发表信息：
Physical Review Materials 7, 014805(2023)
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摘要：

我们报道了两种新型高熵硅化物（HES）的合成、晶体结构和物理性能，即（Nb $_{0.1}$ Mo $_{0.1}$ W $_{0.3}$ Re $_{0.2}$ Ru $_{0.1}$）$_{5}$ Si $_{3}$和（Nb $_{0.2}$ Mo $_{0.3}$ W $_{0.3}$ Re $_{0.1}$ Ru $_{0.1}$）$_{5}$ Si $_{3}$。结构分析表明，这两种HES由（几乎）单一的四元W $_{5}$ Si $_{3}$型相（空间群$I$ 4/ $mcm$）与无序的阳离子分布。电阻率、磁化率和比热的测量表明，（Nb $_{0.1}$ Mo $_{0.3}$ W $_{0.3}$ Re $_{0.2}$ Ru $_{0.1}$）$_{5}$ Si $_{3}$和（Nb $_{0.2}$ Mo $_{0.3}$ W $_{0.3}$ Re $_{0.1}$ Ru $_{0.1}$）$_{5}$ Si $_{3}$是弱耦合超导体，代表了第一个超导高熵非氧化物陶瓷.特别地，这些HES与二元对应物相比具有更高的$T_{\rm c}$值（3.2-3.3 K），并且它们的$B_{\rm c2}$（0）/ $T_{\rm c}$比在相同结构类型的超导体中是最大的。

英文摘要：

We report the synthesis, crystal structure and physical properties of two new high-entropy silicides (HESs), namely (Nb$_{0.1}$Mo$_{0.3}$W$_{0.3}$Re$_{0.2}$Ru$_{0.1}$)$_{5}$Si$_{3}$ and (Nb$_{0.2}$Mo$_{0.3}$W$_{0.3}$Re$_{0.1}$Ru$_{0.1}$)$_{5}$Si$_{3}$. Structural analysis indicates that both HESs consist of a (nearly) single tetragonal W$_{5}$Si$_{3}$-type phase (space group $I$4/$mcm$) with a disordered cation distribution. Electrical resistivity, magnetic susceptibility and specific heat measurements show that (Nb$_{0.1}$Mo$_{0.3}$W$_{0.3}$Re$_{0.2}$Ru$_{0.1}$)$_{5}$Si$_{3}$ and (Nb$_{0.2}$Mo$_{0.3}$W$_{0.3}$Re$_{0.1}$Ru$_{0.1}$)$_{5}$Si$_{3}$ are weakly coupled bulk superconductors, which represent the first superconducting high-entropy nonoxide ceramics. In particular, these HESs have higher $T_{\rm c}$ values (3.2-3.3 K) compared with those of the binary counterparts, and their $B_{\rm c2}$(0)/$T_{\rm c}$ ratios are the largest among superconductors of the same structural type.

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