Superconductivity induced by In substitution into the topological crystalline insulator Pb(0.5)Sn(0.5)Te

Abstract

Indium substitution turns the topological crystalline insulator (TCI) Pb${}_{0.5}$Sn${}_{0.5}$Te into a possible topological superconductor. To investigate the effect of the indium concentration on the crystal structure and superconducting properties of (Pb${}_{0.5}$Sn${}_{0.5}$)${}_{1-x}$In${}_x$Te, we have grown high-quality single crystals using a modified floating-zone method, and have performed systematic studies for indium content in the range $0\le x\le 0.35$. We find that the single crystals retain the rock salt structure up to the solubility limit of indium ($x\sim 0.30$). Experimental dependences of the superconducting transition temperature ($T_c$) and the upper critical magnetic field ($H_{c2}$) on the indium content $x$ have been measured. The maximum $T_c$ is determined to be 4.7 K at $x=0.30$, with ${\mu }_0{H}_{c2}(T=0)\approx 5$ T.

4 pages, 5 figures

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• Van Hove Singularity Arising from Mexican-Hat-Shaped Inverted Bands in the Topological Insulator Sn-doped Bi${}_{1.1}$Sb${}_{0.9}$Te${}_2$S
• Electron-phonon coupling and superconductivity in the doped topological-crystalline insulator (Pb${}_{0.5}$Sn${}_{0.5}$)${}_{1-x}$In${}_x$Te
• Low-energy phonons and superconductivity in Sn${}_{0.8}$In${}_{0.2}$Te