Superconductivity at 38 K in Iron-Based Compound with Platinum-Arsenide   Layers Ca10(Pt4As8)(Fe2-xPtxAs2)5
  We report superconductivity in novel iron-based compounds Ca10(PtnAs8)(Fe2-xPtxAs2)5 with n = 3 and 4. Both compounds crystallize in triclinic structures (space group P-1), in which Fe2As2 layers alternate with PtnAs8 spacer layers. Superconductivity with a transition temperature of 38 K is observed in the n = 4 compound with a Pt content of x ~ 0.36 in the Fe2As2 layers. The compound with n = 3 exhibits superconductivity at 13 K. 
Satomi Kakiya, Kazutaka Kudo, Yoshihiro Nishikubo, Kenta Oku, Eiji   Nishibori, Hiroshi Sawa, Takahisa Yamamoto, Toshio Noza...
cond-mat.supr-con