Superconductivity in a Misfit Layered (SnS)_1.15(TaS₂) Compound

We report the single crystal growth and superconducting properties of a misfit layered (SnS) 1.15 (TaS 2 ) compound. The transport, magnetic, and thermodynamic properties revealed the superconducting transition with an onset temperature of T c ∼ 3.01 K. The high resolution transmission electron microscopy (HRTEM) image clearly shows the misfit stacking of SnS and TaS 2 layers. Based on the Werthamer–Helfand–Hohenberg (WHH) formula and Ginzburg–Landau theory, the upper critical fields are H c 2 (0) = 0.64 ± 0.06 T and 0.22 ± 0.02 T with coherence lengths of ξ = 22.67 and 38.68 nm for field applied perpendicular ( H ⊥ ) and parallel ( H // ) to the plane, respectively. On the basis of the specific heat measurement data analysis of derived parameters including Sommerfeld coefficient γ = 5.831 ± 0.012 mJ mol –1 K –2, Debye temperature Θ D = 151 K, specific heat jump Δ C e / γT c = 0.812, and electron–phonon coupling constant λ el–ph ∼ 0.724, all indicate the weak-coupling nature for (SnS) 1.15 (TaS 2 ) as a misfit layered superconductor. Resistivity measurements show that T c increases from temperature 3.01 to 3.85 K at 1.95 GPa, and linear dependence of T c as a function of pressure ( P ) is observed up to 1.583 GPa.