Superconductivity in the antiperovskite oxide “SnOSr3-x”

Date

Mar 2, 2017

Time

11:00 AM - 1:00 PM

Speaker

Prof. Yoshiteru Maeno

Affiliation

Department of Physics, Kyoto University, Japan

Language

en

Main Topic

Chemie

Other Topics

Physik, Chemie

Host

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

Description

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

Last modified: Mar 2, 2017, 8:56:05 AM