Experimental and first-principles studies of superconductivity in topological nodal line semimetal SnTaS2. (1st June 2022)

• Record Type: Journal Article
• Authors: Ash, Soumen; Naskar, Moumita; P N, Ravi Shankar; Jena, Nityasagar; Sundaresan, A; Ganguli, Ashok Kumar
• Is Part Of: Superconductor science & technology. Volume 35:Number 6(2022)
• Publication Date: 2022-06-01
• Subjects: superconductivity -- topological phase -- transition metal dichalcogenide -- first-principles study; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/ac5aa8
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: 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 P 6 3 / m m c . Electrical resistivity, magnetization and specific heat data suggest SnTaS2 to be a weakly coupled, type-II superconductor with T c ≈ 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.