Superconductivity by rare earth doping in the 1038-type compounds with RE=Y, La–Nd, Sm–Lu

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 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 T c ( x RE ) phase diagram for electron doping in all these systems. The absence of superconductivity in Eu2+ 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 analogous to other iron-based superconductors with simpler crystal structures.