2021/11/24 by Yuki Nakahira, Nakahira, Yuki, Ryosuke Kiyama +13 · 1 citation
Engineering · Earth and Planetary Sciences · #High Entropy Alloys Studies #High-pressure geophysics and materials #Intermetallics and Advanced Alloy Properties
paper · pdf · doi:10.48550/arxiv.2111.12391
Compositionally complex alloys (CCAs) are a new category of high-entropy materials containing more than two high-entropy phases in an alloy sample. We applied the concept of CCA to a A15-type compound superconductor V3X where X site is occupied by Al, Si, Ga, Ge, and Sn. The V3X sample shows bulk superconductivity with a transition temperature (Tc) of 6.4 K, which is close to the Tc of V3Ge. The upper critical field (Bc2(0)) of V3X estimated from magnetic susceptibility is 8.8 T, which is ~50% higher than that of V3Ge (Bc2(0) = 5.8 T). The presence of at least five different A15 phases with high configurational entropy of mixing were revealed. We consider that the examined V3X sample is an example system of CCA-type superconducting intermetallic compound.