Bulk superconductivity in the Dirac semimetal TlSb
Bulk superconductivity in the Dirac semimetal TlSb
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DOI：
10.1007/s11433-020-1653-x
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
Yuxing Zhou;Bin Li;Zhefeng Lou;Huancheng Chen;Qin Chen;Binjie Xu;Chun-Shian Wu;Jianhua Du;Jinhu Yang;Hangdong Wang;M. Fang
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文献类型：
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作者：
Yuxing Zhou;Bin Li;Zhefeng Lou;Huancheng Chen;Qin Chen;Binjie Xu;Chun-Shian Wu;Jianhua Du;Jinhu Yang;Hangdong Wang;M. Fang
实现马约拉纳费米子的一个可行的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。本文对具有CsCl型结构的TlSb化合物的电子能带结构、费米面和表面态进行了计算，并测量了其电阻率、磁化强度和比热。能带结构计算表明，考虑自旋轨道耦合时，TlSb是一种狄拉克半金属。首次确定TlSb为Ⅱ型超导体，Tc = 4.38K，Hc_1（0）= 148Oe，Hc_2（0）= 1.12T，κGL= 10.6。我们还证实了TlSb是一种中等耦合波超导体。虽然我们不能确定费米能级EF附近的能带是超导的原因，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一个简单的材料平台。
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 withTc=4.38 K,Hc1(0) = 148 Oe,Hc2(0)=1.12 T, andκGL= 10.6. We also confirm that TlSb is a moderately coupleds-wave superconductor. Although we cannot determine the band near the Fermi levelEFthat 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.