论文标题
旋转厅候选TA3SB的超导性能具有八倍的退化
Superconducting properties of the spin Hall candidate Ta3Sb with eightfold degeneracy
论文作者
论文摘要
我们报告了纯TA3SB相的合成和表征，该材料被预测为具有八倍变性的费米度状态[Science 353，AAF5037（2016）]，并表现出较大的自旋效应[SCI。 ADV。 5，EAAV8575（2019]。我们在电阻率\ r {ho}（t）和特定的热C（t）测量中观察到具有TC〜0.67 K的TA3SB和TC〜0.67 K的超导能力。磁场依赖性测量结果产生超导相位图，并带有与HC2的上限（0）〜0.95 t，相应的距离〜0.95 t，相应的距离， NM。从特定的热异常中推导的差距为2Δ0/kbtc是3.46，接近Bardeen-Cooper-Schrieffer（BCS）的值为3.53 II型超导体。在具有拓扑表面状态的八倍的费米子化合物中观察超导率，并预测了大型旋转霍尔电导位置TA3SB作为一个吸引人的平台，以进一步探索多率退化系统中的外来量子状态。
We report the synthesis and characterization of phase pure Ta3Sb, a material predicted to be topological with eightfold degenerate fermionic states [Science 353, aaf5037 (2016)] and to exhibit a large spin Hall effect [Sci. Adv. 5, eaav8575 (2019]. We observe superconductivity in Ta3Sb with Tc~ 0.67 K in both electrical resistivity \r{ho}(T) and specific heat C(T) measurements. Field dependent measurements yield the superconducting phase diagram with an upper critical field of Hc2(0) ~ 0.95 T, corresponding to a superconducting coherence length of ξ ~18.6 nm. The gap ratio deduced from specific heat anomaly, 2Δ0/kBTc is 3.46, a value close to the Bardeen-Cooper-Schrieffer (BCS) value of 3.53. From a detailed analysis of both the transport and thermodynamic data within the Ginsburg-Landau (GL) framework, a GL parameter of \k{appa} ~90 is obtained identifying Ta3Sb as an extreme type-II superconductor. The observation of superconductivity in an eightfold degenerate fermionic compound with topological surface states and predicted large spin Hall conductance positions Ta3Sb as an appealing platform to further explore exotic quantum states in multifold degenerate systems.
