Superconductivity by transition metal doping in Ca₁₀(Fe_1−xM_xAs)₁₀(Pt₃As₈) (M = Co, Ni, Cu)

Abstract

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

Keywords:

• superconductivity
• iron arsenides
• doping
• crystal structure
• platinum
• cobalt
• nickel
• copper

Notes

This work was financially supported by the German Research Foundation (DFG) within the priority program SPP1458.