Superconductivity by rare earth doping in the 1038-type compounds (Ca$_{1-x}$RE$_x$)$_{10}$(FeAs)$_{10}$(Pt$_3$As$_8$) with RE = Y, La-Nd, Sm-Lu

TL;DR

This study demonstrates that rare earth doping induces superconductivity up to 35 K in 1038-type compounds, with a universal phase diagram for electron doping, highlighting similarities with other iron-based superconductors.

Contribution

It reveals that rare earth doping universally induces superconductivity in 1038-type compounds with a consistent phase diagram, and clarifies the electron doping mechanism's similarity to other iron-based superconductors.

Findings

Superconductivity observed up to 35 K in RE-doped compounds.

Universal T_c(x) phase diagram for different RE elements.

Electron doping mechanism is analogous to other iron-based superconductors.

Abstract

We report superconductivity in polycrystalline samples of the 1038-type compounds (Ca$_{1-x}$RE$_x$)$_{10}$(FeAs)$_{10}$(Pt$_3$As$_8$) up to T$_c$ = 35 K with RE = Y, La-Nd, Sm, Gd-Lu. The critical temperatures are independent of the trivalent rare earth element used, yielding an universal T$_c$($x$) phase diagram for electron doping in all these systems. The absence of superconductivity in Eu$^{2+}$ doped samples, as well as the close resemblance of (Ca$_{1-x}$RE$_x$)$_{10}$(FeAs)$_{10}$(Pt$_3$As$_8$) to the 1048 compound substantiate that the electron doping scenario in the RE-1038 and 1048 phases is completely analogous to other iron-based superconductors with simpler crystal structures.