A New ZrCuSiAs-Type Superconductor: ThFeAsN
  We report the first nitrogen-containing iron-pnictide superconductor ThFeAsN, which is synthesized by a solid-state reaction in an evacuated container. The compound crystallizes in a ZrCuSiAs-type structure with the space group P4/nmm and lattice parameters a=4.0367(1) {\AA} and c=8.5262(2) {\AA} at 300 K. The electrical resistivity and dc magnetic susceptibility measurements indicate superconductivity at 30 K for the nominally undoped ThFeAsN. 
Cao Wang, Zhi-Cheng Wang, Yu-Xue Mei, Yu-Ke Li, Lin Li, Zhang-Tu Tang,   Yi Liu, Pan Zhang, Hui-Fei Zhai, Zhu-An Xu and Guan...
cond-mat.supr-con