Tetragonality induced superconductivity in anti-ThCr2Si2-type RE2O2Bi (RE = rare earth) with Bi square nets

Ryosuke Sei; Hideyuki Kawasoko; Kota Matsumoto; Masato Arimitsu; Kyohei Terakado; Daichi Oka; Shintaro Fukuda; Noriaki Kimura; Hidetaka Kasai; Eiji Nishibori; Kenji Ohoyama; Akinori Hoshikawa; Toru Ishigaki; Tetsuya Hasegawa; Tomoteru Fukumura

doi:10.1039/c9dt04640b

Tetragonality induced superconductivity in anti-ThCr₂Si₂-type RE₂O₂Bi (RE = rare earth) with Bi square nets

Dalton Trans. 2020 Mar 14;49(10):3321-3325. doi: 10.1039/c9dt04640b. Epub 2020 Feb 26.

Authors

Ryosuke Sei¹, Hideyuki Kawasoko, Kota Matsumoto, Masato Arimitsu, Kyohei Terakado, Daichi Oka, Shintaro Fukuda, Noriaki Kimura, Hidetaka Kasai, Eiji Nishibori, Kenji Ohoyama, Akinori Hoshikawa, Toru Ishigaki, Tetsuya Hasegawa, Tomoteru Fukumura

Affiliation

¹ Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan. tomoteru.fukumura.e4@tohoku.ac.jp.

PMID: 32101188
DOI: 10.1039/c9dt04640b

Abstract

We report a series of layered superconductors, anti-ThCr₂Si₂-type RE₂O₂Bi (RE = rare earth), composed of electrically conductive Bi square nets and magnetic insulating RE₂O₂ layers. Superconductivity was induced by separating the Bi square nets as a result of excess oxygen incorporation, irrespective of the presence of magnetic ordering in RE₂O₂ layers. Intriguingly, the transition temperature of all RE₂O₂Bi including nonmagnetic Y₂O₂Bi was approximately scaled by unit cell tetragonality (c/a), implying a key role in the relative separation of the Bi square nets to induce superconductivity.