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

Hiroyuki Yakita; Hiraku Ogino; Tomoyuki Okada; Akiyasu Yamamoto; Kohji Kishio; Tetsuya Tohei; Yuichi Ikuhara; Yoshito Gotoh; Hiroshi Fujihisa; Kunimitsu Kataoka; Hiroshi Eisaki; Jun-ichi Shimoyama

doi:10.1021/ja410845b

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

J Am Chem Soc. 2014 Jan 22;136(3):846-9. doi: 10.1021/ja410845b. Epub 2014 Jan 7.

Authors

Hiroyuki Yakita¹, Hiraku Ogino, Tomoyuki Okada, Akiyasu Yamamoto, Kohji Kishio, Tetsuya Tohei, Yuichi Ikuhara, Yoshito Gotoh, Hiroshi Fujihisa, Kunimitsu Kataoka, Hiroshi Eisaki, Jun-ichi Shimoyama

Affiliation

¹ Department of Applied Chemistry, The University of Tokyo , 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan.

PMID: 24387288
DOI: 10.1021/ja410845b

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.