A new layered iron arsenide superconductor: (Ca,Pr)FeAs2.

Authors :: Yakita H
Ogino H
Okada T
Yamamoto A
Kishio K
Tohei T
Ikuhara Y
Gotoh Y
Fujihisa H
Kataoka K
Eisaki H
Shimoyama J
Source :: Journal of the American Chemical Society [J Am Chem Soc] 2014 Jan 22; Vol. 136 (3), pp. 846-9. Date of Electronic Publication: 2014 Jan 07.
Publication Year :: 2014
Abstract: 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 P2₁/m, composed of two Ca(Pr) planes, Fe2As2 layers, and As2 zigzag chain layers. Plate-like crystals of the new phase showed superconductivity, with a T(c) of ~20 K in both magnetization and resistivity measurements.