||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, MasatoshiMaeno, 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. SrSnO 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 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.