Superconductivity in the antiperovskite Dirac-metal oxide Sr3−xSnO

Mohamed Oudah (), Atsutoshi Ikeda, Jan Niklas Hausmann, Shingo Yonezawa (), Toshiyuki Fukumoto, Shingo Kobayashi, Masatoshi Sato and Yoshiteru Maeno ()
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Mohamed Oudah: Graduate School of Science, Kyoto University
Atsutoshi Ikeda: Graduate School of Science, Kyoto University
Jan Niklas Hausmann: Graduate School of Science, Kyoto University
Shingo Yonezawa: Graduate School of Science, Kyoto University
Toshiyuki Fukumoto: Graduate School of Engineering, Nagoya University
Shingo Kobayashi: Graduate School of Engineering, Nagoya University
Masatoshi Sato: Yukawa Institute for Theoretical Physics, Kyoto University
Yoshiteru Maeno: Graduate School of Science, Kyoto University

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract 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 Sr3−xSnO with the transition temperature of around 5 K. Sr3SnO 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 3He-B in moderately hole-doped Sr3−xSnO. 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.

Date: 2016
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DOI: 10.1038/ncomms13617

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