Superconductivity by transition metal doping in Ca$_{10}$(Fe$_{1-x}$M$_x$As)$_{10}$(Pt$_3$As$_8$) (M = Co, Ni, Cu)

TL;DR

This study demonstrates that doping Co and Ni into the 1038 phase compound induces superconductivity with Tc up to 15 K, revealing a universal behavior in iron arsenide superconductors despite complex structures.

Contribution

It reports the successful doping of Co, Ni, and Cu into the 1038 phase compound and compares the resulting superconducting phase diagrams, highlighting the universality of superconductivity behavior.

Findings

Superconductivity achieved in Co and Ni doped compounds with Tc up to 15 K.

No superconductivity observed in Cu doped compound.

Phase diagrams resemble those of other iron arsenide superconductors.

Abstract

We report the successful substitution of cobalt, nickel, and copper for iron in the 1038 phase parent compound Ca$_{10}$(FeAs)$_{10}$(Pt$_3$As$_8$) yielding Ca$_{10}$(Fe$_{1-x}$Co$_x$As)$_{10}$(Pt$_3$As$_8$), Ca$_{10}$(Fe$_{1-x}$Ni$_x$As)$_{10}$(Pt$_3$As$_8$), and Ca$_{10}$(Fe$_{1-x}$Cu$_x$As)$_{10}$(Pt$_3$As$_8$), respectively. Superconductivity is induced in Co and Ni doped compounds reaching critical temperatures up to 15 K, similar to known Pt substituted Ca$_{10}$(Fe$_{1-x}$Pt$_x$As)$_{10}$(Pt$_3$As$_8$), whereas no superconductivity was detected in Ca$_{10}$(Fe$_{1-x}$Cu$_x$As)$_{10}$(Pt$_3$As$_8$). 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.