Breaking the universal T<sub>c</sub>-P relation to higher T<sub>c</sub> of cuprate HTS

ORAL

Abstract

By investigating the bulk superconducting state via dc magnetization measurements, we have discovered the resurgence of the superconductive transition temperature Tcs of the monolayer Bi2Sr2CuO6+δ and bilayer Bi2Sr2CaCu2O8+δ to beyond the maximum Tc-maxs predicted by the universal Tc-P relation at higher pressures. We have attributed the resurgence to a possible pressure-induced electronic transition in the compounds, associated with a charge transfer between the Cu 3dx2-y2 and the O 2p bands, leading to an increase of the density of states at the Fermi level, in agreement with our density functional theory calculations. Similar Tc-P behavior has also been reported in the trilayer Br2Sr2Ca2Cu3O10+δ. The observations suggest that higher Tcs in the layered cuprate high temperature superconductors than those previously reported can be achieved by breaking away from the universal Tc-P by the application of higher pressures.

*The work performed at the Texas Center for Superconductivity at the University of Houston is supported by US Air Force Office of Scientific Research Grant FA9550-15-1-0236, 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

  • Ching-Wu Chu

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston TX 77204
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204
    • Texas Center for Superconductivity, University of Houston, Texas 77204, USA
    • The Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

Authors

  • Ching-Wu Chu

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston TX 77204
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204
    • Texas Center for Superconductivity, University of Houston, Texas 77204, USA
    • The Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

  • Liangzi Deng

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

  • Yongping Zheng

    • Materials Science & Engineering, University of Texas at Dallas, Richardson, TX 75080

  • Zheng Wu

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston TX 77204
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • The Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

  • Shuyuan Huyan

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204

  • Hung-Cheng Wu

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

  • Kyeongjae Cho

    • Materials Science and Engineering, The University of Texas at Dallas
    • Materials Science & Engineering, University of Texas at Dallas, Richardson, TX 75080