We report a detailed study of superconductivity in polycrystalline SnTaS₂ using electrical transport, magnetization and heat capacity measurements. SnTaS₂ crystallizes in centrosymmetric hexagonal structure with space group P63/mmc . Electrical resistivity, magnetization and specific heat data suggest SnTaS₂ to be a weakly coupled, type-II superconductor with Tc≈2.8 K. First-principles calculations show signature for nodal line topology in the electronic band structure, protected by the spatial-inversion and time-reversal symmetries, that strongly gapped out by the inclusion of spin–orbit coupling. Superconductivity in layered SnTaS₂ with nodal line topological state makes it a strong candidate to be considered for a 3D topological superconductor.

中文翻译：

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拓扑节点线半金属 SnTaS2 中超导性的实验和第一性原理研究

我们报告了使用电传输、磁化和热容量测量对多晶 SnTaS ₂中的超导性进行的详细研究。SnTaS ₂结晶为具有空间群的中心对称六方结构 P6个3个/米米C . 电阻率、磁化强度和比热数据表明 SnTaS ₂是一种弱耦合的 II 型超导体，具有 吨C≈2.8 K. 第一性原理计算显示电子能带结构中节点线拓扑的特征，受空间反转和时间反转对称性的保护，由于包含自旋轨道耦合而强烈缺口。具有节点线拓扑状态的层状 SnTaS ₂的超导性使其成为 3D 拓扑超导体的有力候选者。