Experimental and first-principles studies of superconductivity in topological nodal line semimetal SnTaS${}_2$

Abstract

We report a detailed study of superconductivity in polycrystalline SnTaS${}_2$ using electrical transport, magnetization and heat capacity measurements. SnTaS${}_2$ crystallizes in centrosymmetric hexagonal structure with space group $P{6}_3/mmc$. Electrical resistivity, magnetization and specific heat data suggest SnTaS${}_2$ to be a weakly coupled, type-II superconductor with $T_c\approx$ 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 (SOC). Superconductivity in layered SnTaS${}_2$ with nodal line topological state makes it a strong candidate to be considered for a 3D topological superconductor.

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