Journal Article Superconductivity in the antiperovskite Dirac-metal oxide Sr[3−x]SnO

Oudah, Mohamed  ,  Ikeda, Atsutoshi  ,  Hausmann, Jan Niklas  ,  Yonezawa, Shingo  ,  Fukumoto, Toshiyuki  ,  Kobayashi, Shingo  ,  Sato, Masatoshi  ,  Maeno, Yoshiteru

72016-12-12 , Springer Nature
マイナス金属イオンを含む酸化物で超伝導を発見 : 逆ペロブスカイト酸化物初の超伝導体. 京都大学プレスリリース. 2016-12-13.
Investigations of perovskite oxides triggered by the discovery of high-temperature and unconventional superconductors have had crucial roles in stimulating and guiding the development of modern condensed-matter physics. Antiperovskite oxides are charge-inverted counterpart materials to perovskite oxides, with unusual negative ionic states of a constituent metal. No superconductivity was reported among the antiperovskite oxides so far. Here we present the first superconducting antiperovskite oxide Sr[3−x]SnO with the transition temperature of around 5 K. Sr[3]SnO possesses Dirac points in its electronic structure, and we propose from theoretical analysis a possibility of a topological odd-parity superconductivity analogous to the superfluid [3]He-B in moderately hole-doped Sr[3−x]SnO. We envision that this discovery of a new class of oxide superconductors will lead to a rapid progress in physics and chemistry of antiperovskite oxides consisting of unusual metallic anions.

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