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†

Ryosuke Sei,^ab Hideyuki Kawasoko,

^a Kota Matsumoto,^a Masato Arimitsu,^a Kyohei Terakado,^a Daichi Oka,

^a Shintaro Fukuda,^a Noriaki Kimura,^c Hidetaka Kasai,^d Eiji Nishibori,^d Kenji Ohoyama,^e Akinori Hoshikawa,^f Toru Ishigaki,^f Tetsuya Hasegawa^b and Tomoteru Fukumura

*^ag

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* Corresponding authors

^a Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
E-mail: tomoteru.fukumura.e4@tohoku.ac.jp

^b Department of Chemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan

^c Department of Physics, Graduate School of Science; Center for Low Temperature Science, Tohoku University, Sendai 980-8578, Japan

^d Division of Physics and Tsukuba Research Center for Energy Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan

^e Graduate School of Science and Engineering, Ibaraki University, Tokai 319-1106, Japan

^f Frontier Research Center for Applied Atomic Sciences, Ibaraki University, Tokai, Japan

^g Advanced Institute for Materials Research and Core Research Cluster, Tohoku University, Sendai, Japan

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.

Dalton Transactions

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

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

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