Retention of metastable superconductivity in FeSe up to 24 K at ambient by pressure quenching

ORAL

Abstract

High pressure has been shown to be an effective route to achieving high temperature superconductivity. This is exemplified by the current record high Tcs at 164 K in the cuprate HgBa2Ca2Cu3O8+δ under ~31 GPa and at 287 K in C-S-H under ~ 267 GPa. These impressive record high Tcs are significant not only scientifically, but also technologically. Should these superconducting (sc) states under high pressures be retained at ambient, their impacts on technology would be profound and limited only by the imagination. We have chosen the sc FeSe and non-sc Cu-doped FeSe as model compounds to test this possibility. We have succeeded in retaining the high-pressure sc phase with a Tc up to 24 K upon the complete removal of pressure at 77 K following a specific thermodynamic path. A high-pressure non-sc phase of FeSe was also retained and proved to be stable up to room temperature. Detailed results will be presented and discussed.

*The work is supported by US Air Force Office of Scientific Research Grant FA9550-15-1-0236 and FA9550-20-1-0068, the T. L. L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston.

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Presenters

  • Liangzi Deng

    • University of Houston
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity & Physics Department at University of Houston
    • University of Houston, Texas Center for Superconductivity
    • Texas Center of Superconductivity and Physics Department at the University of Houston
    • TcSUH and Dept of Physics, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity and Department of Physics, University of Houston

Authors

  • Liangzi Deng

    • University of Houston
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity & Physics Department at University of Houston
    • University of Houston, Texas Center for Superconductivity
    • Texas Center of Superconductivity and Physics Department at the University of Houston
    • TcSUH and Dept of Physics, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity and Department of Physics, University of Houston

  • Trevor Bontke

    • University of Houston
    • Texas Center for Superconductivity & Physics Department at University of Houston
    • Texas Center of Superconductivity and Physics Department at the University of Houston

  • Rabin Dahal

    • University of Houston
    • Texas Center for Superconductivity & Physics Department at University of Houston
    • Texas Center of Superconductivity and Physics Department at the University of Houston

  • Bin Gao

    • Rice University
    • Rutgers Center for Emergent Materials, Rutgers University
    • Department of Physics and astronomy, Rice University
    • Department of Physics and Astronomy, Rice University
    • Rice Univ

  • Zheng Wu

    • Texas Center of Superconductivity and Physics Department at the University of Houston

  • Melissa Gooch

    • Texas Center of Superconductivity and Physics Department at the University of Houston

  • Tong Chen

    • Rice University
    • Department of Physics and astronomy, Rice University
    • Rice Univ

  • Pengcheng Dai

    • Rice Univ
    • Rice University
    • Department of Physics and astronomy, Rice University
    • Department of Physics and Astronomy, Rice University

  • Ching W Chu

    • Texas Center for Superconductivity & Physics Department at University of Houston
    • Texas Center for Superconductivity, University of Houston
    • University of Houston, Texas Center for Superconductivity
    • Texas Center of Superconductivity and Physics Department at the University of Houston
    • TcSUH and Dept of Physics, University of Houston