Superconductivity in the antiperovskite oxide “SnOSr3-x”

Datum

02.03.2017

Zeit

11:00 - 13:00

Sprecher

Prof. Yoshiteru Maeno

Zugehörigkeit

Department of Physics, Kyoto University, Japan

Sprache

en

Hauptthema

Chemie

Andere Themen

Physik, Chemie

Host

Prof. Dr. A.P. Mackenzie, Dr. T. Oka

Beschreibung

Oxides with perovskite-based structures have been known as essential materials for fascinating phenomena such as high-temperature superconductivity and unconventional superconductivity. The base of these materials, the cubic perovskite oxides, ABO3, also exhibit superconductivity as in SrTiO3- x and Ba0.6K0.4BiO3. Perovskite oxides have their counterparts, antiperovskite oxides A3BO (or “BOA3”), in which the position of metal and oxygen ions are reversed and therefore metallic B ions take unusual negative valence states. We have recently discovered the superconductivity in “SnOSr3-x”, the first among antiperovskite oxides, with the transition temperature of around 5 K [1]. According to the band-structure calculations, Sr3SnO possesses Dirac points and is a candidate topological crystalline insulator. We propose from theoretical analysis a possibility of a topological odd-parity superconductivity in moderately hole- doped Sr3SnO. We envision that this discovery of a new class of oxide superconductors will lead a progress in physics and chemistry of oxides containing unusual metallic anions. This work was mainly supported by the JSPS KAKENHI (No. JP15H05852). [1] “Superconductivity in the antiperovskite Dirac-metal oxide Sr3-xSnO”, Mohamed Oudah, Atsutoshi Ikeda, ShingoYonezawa, Toshiyuki Fukumoto, Shingo Kobayashi, Masatoshi Sato and Yoshitru Maeno, Nature Commun. 7, 13617 (2016).

Links

• MPI CPfS

Letztmalig verändert: 02.03.2017, 08:56:05