A New Layered Iron Arsenide Superconductor: (Ca,Pr)FeAs2

Yakita H; Ogino H; Okada T; Yamamoto A; Kishio K; Tohei T; Ikuhara Y; Gotoh Y; Fujihisa H; Kataoka K; Eisaki H; Shimoyama J

Journal of the American Chemical Society, Vol.136, No.3, 846-849, 2014

Yakita H, Ogino H, Okada T, Yamamoto A, Kishio K, Tohei T, Ikuhara Y, Gotoh Y, Fujihisa H, Kataoka K, Eisaki H, Shimoyama J

A new iron-based superconductor, (Ca,Pr)FeAs2, was discovered. Plate-like crystals of the new phase were obtained, and its crystal structure was investigated by single-crystal X-ray diffraction analysis. The structure was identified as the monoclinic system with space group P2(1)/m, composed of two Ca(Pr) planes, Fe2As2 layers, and As-2 zigzag chain layers. Plate-like crystals of the new phase showed superconductivity, with a T-c of similar to 20 K in both magnetization and resistivity measurements.