Anisotropic superconductivity and quantum oscillations in the layered dichalcogenide TaSnS2

Experimental and first-principles studies of superconductivity in topological nodal line semimetal SnTaS2

“…Recent discovery of superconductivity in noncentrosymmetric topological nodal line semimetal PbTaSe 2 [34][35][36][37] has opened up a new avenue to explore the possibility of finding superconductivity and novel surface topology in related isoelectronic systems [38][39][40]. SnTaS 2 [41][42][43] and PbTaS 2 [44] with a centrosymmetric crystal structure are the latest additions to this family of intercalated 112-type transition metal dichalcogenide based topological nodal line superconductors.…”

“…The crystal structure and physical properties of SnTaS 2 were studied earlier in considerable detail [45][46][47][48][49][50][51][52][53][54][55]. Albeit the superconducting critical temperature (T c ≈ 2.5-2.95 K) [47][48][49] and electronic structure [49,56,57] of SnTaS 2 were known, a detailed investigation of its superconductivity and topological properties was not reported until recently [41][42][43]. Although there are a few reports on the single crystal SnTaS 2 , an extensive study on superconducting properties of the polycrystalline system is still required.…”

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

“…Recent discovery of superconductivity in noncentrosymmetric topological nodal line semimetal PbTaSe 2 [33][34][35][36] has opened up a new avenue to explore the possibility of finding superconductivity and novel surface topology in related isoelectronic systems [37][38][39]. SnTaS 2 * E-mail: ashok@chemistry.iitd.ac.in [40][41][42] and PbTaS 2 [43] with a centrosymmetric crystal structure are the latest additions to this family of intercalated 112-type transition metal dichalcogenide based topological nodal line superconductors.…”

“…The crystal structure and physical properties of SnTaS 2 were studied earlier in considerable detail [44][45][46][47][48][49][50][51][52][53][54]. Albeit the superconducting critical temperature (T c ≈ 2.5 -2.95 K) [46][47][48] and electronic structure [48,55,56] of SnTaS 2 were known, a detailed investigation of its superconductivity and topological properties was not reported until recently [40][41][42]. Although there are a few reports on the single crystal SnTaS 2 , an extensive study on superconducting properties of the polycrystalline system is still required.…”

Evidences of Topological Surface States in the Nodal-Line Semimetal SnTaS2 Nanoflakes

“…In addition, superconductors with nontrivial band structures have also attracted much attention due to the possibility of realizing topological superconductors. − Currently, topological superconductor candidates have been reported in a number of limited material systems, including Bi 2 Se 3 intercalated by Cu, Sr, or Nb atoms, − β-PdBi 2 , , highly pressured Cd 3 As 2 and WTe 2 , − and topological insulator/superconductor heterostructures − or topological materials with superconductivity. ,,, Recently, the centrosymmetric superconductor SnTaS 2 was proposed to be a topological superconductor candidate with T c ∼ 3.0 K, where topological NL states and drumhead-like surface around E F were recognized by angle-resolved photoemission spectroscopy (ARPES) study. − However, evidence of the topological surface state via electrical transport measurements is still lacking. The most common way to detect the surface state is to explore the 2D character of the angular dependent Shubnikov–de Haas (SdH) quantum oscillations of the surface state, ,− but it faces great challenges due to the influence of the bulk states.…”