paper

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

arXiv:2302.00844 · doi:10.1103/PhysRevMaterials.7.014805

Abstract

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/ $m c m$ ) 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 $T_{c}$ values (3.2-3.3 K) compared with those of the binary counterparts, and their $B_{c2}$ (0)/ $T_{c}$ ratios are the largest among superconductors of the same structural type.

8 pages, 5 figures

High-entropy silicide superconductors with W5​Si3​-type structure

Abstract

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