Superconductivity in a Misfit Layered (SnS)1.15(TaS2) Compound
Journal
Chemistry of Materials
Journal Volume
30
Journal Issue
4
Pages
1373-1378
Date Issued
2018
Author(s)
Abstract
We report the single crystal growth and superconducting properties of a misfit layered (SnS)1.15(TaS2) compound. The transport, magnetic, and thermodynamic properties revealed the superconducting transition with an onset temperature of Tc ∼ 3.01 K. The high resolution transmission electron microscopy (HRTEM) image clearly shows the misfit stacking of SnS and TaS2 layers. Based on the Werthamer-Helfand-Hohenberg (WHH) formula and Ginzburg-Landau theory, the upper critical fields are Hc2(0) = 0.64 ± 0.06 T and 0.22 ± 0.02 T with coherence lengths of η = 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 ⊖D = 151 K, specific heat jump ΔCe/γTc = 0.812, and electron-phonon coupling constant λel-ph ∼ 0.724, all indicate the weak-coupling nature for (SnS)1.15(TaS2) as a misfit layered superconductor. Resistivity measurements show that Tc increases from temperature 3.01 to 3.85 K at 1.95 GPa, and linear dependence of Tc as a function of pressure (P) is observed up to 1.583 GPa.
Publisher
American Chemical Society
Type
journal article