Bulk Superconductivity in Fe(Te,Se) Single Crystals Induced by Post Annealing

ORAL

Abstract

Fe(Te,Se) has the simplest structure among all iron-based superconductors. However, as-grown crystals of Fe(Te,Se) do not show superconductivity, and post treatment is necessary to induce superconductivity. We found that the annealing in controlled O$_{\mathrm{2}}$ atmosphere or other chalcogen (Te, Se, S) atmosphere at relatively low temperatures is very effective to induce superconductivity. During the annealing process, some iron oxides or iron chalcogenides are formed on the surface of the crystal, that effectively extract excess iron from the crystal. Physical properties such as resistivity, Hall coefficient, magnetization, specific heat, and the critical current density are measured before and after the post annealing to discussed the intrinsic properties of Fe(Te,Se) superconductors.

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Authors

  • Tsuyoshi Tamegai

    Department of Applied Physics, The University of Tokyo

  • Yue Sun

    Department of Physics, Southeast University

  • Yuji Tsuchiya

    Department of Applied Physics, The University of Tokyo

  • Tatsuhiro Yamada

    Department of Applied Physics, The University of Tokyo

  • Toshihiro Taen

    Department of Applied Physics, The University of Tokyo

  • Sunseng Pyon

    Department of Applied Physics, The University of Tokyo

  • Zhixiang Shi

    Department of Physics, Southeast University, Department of Physics, Southeast University, Nanjing 211189, China