Superconductivity and Sn-Mössbauer spectra of the antiperovskite oxide Sr<sub>3-<i>x</i></sub>SnO

ORAL

Abstract

We recently reported bulk superconductivity in the antiperovskite oxide Sr3-xSnO, with a possibility of topological nature. We investigate the evolution of superconducting properties with the nominal Sr deficiency x0. In all superconducting samples, two superconducting phases with Tc ≈ 5 K and 1 K appear concurrently that originate from Sr3-xSnO. Mössbauer spectroscopy reveals an unusual Sn4- ionic state in both stoichiometric and superconductive samples. In addition to the main absorption peak, we observe a satellite peak attributable to the Sn sites with nearest-neighbor Sr deficiencies. The intensities of these two peaks exhibit a rather different temperature dependence, possibly reflecting different environment of the lattice vibrations. These results clarifying the Sr deficiency dependence of the normal and superconducting properties of the antiperovskite oxide Sr3-xSnO will promote future work on this class of materials.

*This work was supported by the JSPS KAKENHI Nos. JP15H05851, JP15K21717, JP17J07577, and JP17H04848, by the JSPS Core-to-Core Program, and by Izumi Science and Technology Foundation (Grant No. H28-J-146). AI is supported by Japan Society for the Promotion of Science as JSPS Research Fellow.

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Presenters

  • Atsutoshi Ikeda

    • Department of Physics, Kyoto University, Japan

Authors

  • Atsutoshi Ikeda

    • Department of Physics, Kyoto University, Japan

  • Shinji Kitao

    • Institute for Integrated Radiation and Nuclear Science, Kyoto University, Japan

  • Shun Koibuchi

    • Department of Physics, Kyoto University, Japan

  • Mohamed Oudah

    • University of British Columbia
    • Department of Physics, Kyoto University, Japan

  • Igor Marković

    • University of St Andrews
    • School of Physics and Astronomy, University of St Andrews, UK
    • School of Physics and Astronomy, University of St Andrews, St. Andrews KY16 9SS, United Kingdom

  • Jan Niklas Hausmann

    • Department of Physics, Kyoto University, Japan

  • Shingo Yonezawa

    • Dept. of Physics, Kyoto University
    • Department of Physics, Kyoto University, Kyoto 606-8502, Japan
    • Department of Physics, Kyoto University, Japan

  • Makoto Seto

    • Institute for Integrated Radiation and Nuclear Science, Kyoto University, Japan

  • Yoshiteru Maeno

    • Department of Physics, Kyoto University
    • Dept. of Physics, Kyoto University
    • Department of Physics, Graduate School of Science, Kyoto University, Kyoto, Japan
    • Kyoto University
    • Department of Physics, Graduate School of Science, Kyoto University
    • Department of Physics, Kyoto University, Kyoto 606-8502, Japan
    • Department of Physics, Kyoto University, Japan