Breaking the universal Tc-P relation to higher Tc 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.

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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