Here we report the TiVNbTa medium-entropy alloy (MEA) superconductor with the mixed 3d - 5d elements synthesized by an arc-melting method. The TiVNbTa material has a body-centered cubic structure. The superconducting properties of TiVNbTa were studied by resistivity, magnetic susceptibility, and specific heat measurements. The experimental results show that the bulk superconducting phase transition temperature of TiVNbTa is about 4.65 K, and the upper and lower critical fields are 49.3(4) mT and 5.9(5) T, respectively, which indicates TiVNbTa is a type-II superconductor. First-principles calculations show that the d electrons of Ti, V, Nb, and Ta atoms play a significant role near the Fermi level. The results show TiVNbTa is a traditional s-wave superconductor.
@article{arxiv.2308.15869,
title = {Superconductivity in the medium-entropy alloy TiVNbTa with a body-centered cubic structure},
author = {Kuan Li and Xunwu Hu and Ruixin Guo and Wenrui Jiang and Lingyong Zeng and Longfu Li and Peifeng Yu and Kangwang Wang and Chao Zhang and Shu Guo and Ruidan Zhong and Tao Xie and DaoXin Yao and Huixia Luo},
journal= {arXiv preprint arXiv:2308.15869},
year = {2023}
}