Superconductivity by rare earth doping in the 1038-type compounds (Ca1−xREx)10(FeAs)10(Pt3As8) with RE=Y, La-Nd, Sm-Lu

We report superconductivity in polycrystalline samples of the 1038-type compounds (Ca1−xREx)10(FeAs)10(Pt3As8) up to Tc=35 K with RE=Y, La-Nd, Sm, Gd-Lu. The critical temperatures are nearly independent of the trivalent rare earth element used, yielding a common Tc(xRE) phase diagram for electron doping in all these systems. The absence of superconductivity in Eu2+ doped samples, as well as the close resemblance of (Ca1−xREx)10(FeAs)10(Pt3As8) to the 1048 compound substantiate that the electron doping scenario in the RE-1038 and 1048 phases is analogous to other iron-based superconductors with simpler crystal structures.