A feasible strategy to realize the Majorana fermions is searching for a simple compound with both bulk superconductivity and Dirac surface states. In this paper, we performed calculations of electronic band structure, the Fermi surface and surface states, as well as measured the resistivity, magnetization, specific heat for TlSb compound with a CsCl-type structure. The band structure calculations show that TlSb is a Dirac semimetal when spin-orbit coupling is taken into account. Meanwhile, we first found that TlSb is a type-II superconductor with Tc = 4.38 K, Hc1(0) = 148 Oe, Hc2(0) = 1.12 T and κGL = 10.6, and confirmed it to be a moderately coupled s-wave superconductor. Although we can not determine which bands near the Fermi level EF to be responsible for superconductivity, its coexistence with the topological surface states implies that TlSb compound may be a simple material platform to realize the fault-tolerant quantum computations.
@article{arxiv.2012.03274,
title = {Bulk Superconductivity in the Dirac Semimetal TlSb},
author = {Yuxing Zhou and Bin Li and Zhefeng Lou and Huancheng Chen and Qin Chen and Binjie Xu and Chunxiang Wu and Jianhua Du and Jinhu Yang and Hangdong Wang and Minghu Fang},
journal= {arXiv preprint arXiv:2012.03274},
year = {2021}
}