Superconductivity and Sn-Mössbauer spectra of the antiperovskite oxide Sr3-xSnO

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.

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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