Superconductivity by transition metal doping in Ca₁₀(Fe₁₋ₓMₓAs)₁₀(Pt₃As₈) (M = Co, Ni, Cu)

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We report the successful substitution of cobalt, nickel, and copper for iron in the 1038 phase parent compound Ca₁₀(FeAs)₁₀(Pt₃As₈) yielding Ca₁₀(Fe₁₋ₓCoₓAs)₁₀(Pt₃As₈), Ca₁₀(Fe₁₋ₓNiₓAs)₁₀(Pt₃As₈), and Ca₁₀(Fe₁₋ₓCuₓAs)₁₀(Pt₃As₈), respectively. Superconductivity is induced in Co and Ni doped compounds reaching critical temperatures up to 15 K, similar to known Pt substituted Ca₁₀(Fe₁₋ₓPtₓAs)₁₀(Pt₃As₈), whereas no superconductivity was detected in Ca₁₀(Fe₁₋ₓCuₓAs)₁₀(Pt₃As₈). The obtained Tc(x) phase diagrams are very similar to those of other iron arsenide superconductors indicating rather universal behavior despite the more complex structures of the 1038-type compounds, where the physics is primarily determined by the FeAs layer.