title: A new layered iron arsenide superconductor: (Ca,Pr)FeAs2.
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.
authors.affiliation: Department of Applied Chemistry, The University of Tokyo , 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yakita
authors.forename: Hiraku
authors.initials: H
authors.lastname: Ogino
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Okada
authors.forename: Akiyasu
authors.initials: A
authors.lastname: Yamamoto
authors.forename: Kohji
authors.initials: K
authors.lastname: Kishio
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Tohei
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Ikuhara
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Gotoh
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Fujihisa
authors.forename: Kunimitsu
authors.initials: K
authors.lastname: Kataoka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Eisaki
authors.forename: Jun-ichi
authors.initials: J
authors.lastname: Shimoyama