We report detailed investigations of the properties of a superconductor obtained by substituting In at the Sn site in the topological crystalline insulator (TCI), SnTe. Transport, magnetization, and heat capacity measurements have been performed on crystals of Sn${}_{0.6}$In${}_{0.4}$Te, which is shown to be a bulk superconductor with $T_c^{\mathrm{onset}}$ at $\sim$$4.70\left(5\right)$ K and $T_c^{\mathrm{zero}}$ at $\sim$$3.50\left(5\right)$ K. The upper and lower critical fields are estimated to be ${\mu }_0{H}_{c2}\left(0\right)=1.42\left(3\right)$ T and ${\mu }_0{H}_{c1}\left(0\right)=0.90\left(3\right)$ mT, respectively, while $\kappa =56.4\left(8\right)$ indicates this material is a strongly type-II superconductor.

• Received 11 March 2013

DOI:https://doi.org/10.1103/PhysRevB.87.140507