A feasible strategy for realizing the Majorana fermions is searching for a simple compound with both bulk superconductivity and Dirac surface states. In this paper, we perform calculations of electronic band structure, the Fermi surface, and the surface states, and measure the resistivity, magnetization, and specific heat of a TlSb compound with a CsCl-type structure. The band structure calculations show that TlSb is a Dirac semimetal when spin-orbit coupling is considered. TlSb is first determined to be a type-II superconductor with T_c=4.38 K, H_c1(0) = 148 Oe, H_c2(0)=1.12 T, and κ_GL = 10.6. We also confirm that TlSb is a moderately coupled s-wave superconductor. Although we cannot determine the band near the Fermi level E_F that is responsible for superconductivity, its coexistence with topological surface states implies that the TlSb compound may be a simple material platform to realize the fault-tolerant quantum computations.

实现马约拉那费米子的可行策略是寻找一种既具有体超导性又具有狄拉克表面态的简单化合物。在本文中，我们对电子能带结构，费米表面和表面状态进行了计算，并测量了具有CsCl型结构的TlSb化合物的电阻率，磁化强度和比热。能带结构计算表明，当考虑自旋轨道耦合时，TlsSb是狄拉克半金属。TLSB首先确定为II型超导体Ť _Ç = 4.38 K，ħ _C1（0）= 148奥斯特，ħ _C2（0）= 1.12 T，和κ _GL = 10.6。我们还确认TlSb是中等耦合的s波超导体。尽管我们无法确定造成超导的费米能级E _F附近的能带，但它与拓扑表面态的共存意味着TlSb化合物可能是实现容错量子计算的简单材料平台。