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 x 0.35. We find that the single crystals retain the rocksalt structure up to the solubility limit of indium (x ∼ 0.30). Experimental dependencies 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 μ 0 H c2 (T = 0) ≈ 5 T.

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