Phase Transitions in CuAs-based K$_{x}$Sr$_{1-x}$Cu$_{4}$As$_{2}$ System

ORAL

Abstract

Inspired by the superconductivity with a T$_{c }\sim $ 3.5 K reported by Han et al. in Cu-based LiCu$_{2}$P$_{2}$, the Cu-based compound SrCu$_{4}$As$_{2, }$which has a more complex CuAs layers structure sandwiched by Sr layers, was synthesized and characterized. The magnetoresistance measurements show two anomalies around $\sim $140K and $\sim $60K, respectively, which is also consistent with the results of specific heat measurement. Systematically studies of K-doping into SrCu$_{4}$As$_{2}$ system are carefully investigated at ambient and high pressures and no superconductivity has been found in the K$_{x}$Sr$_{1-x}$Cu$_{4}$As$_{2}$ system down to 2K, although superconductivity might occur at lower temperature in this system. The overall pressure and doping effects on the magnetic and transport properties of the compounds will be presented and discussed.

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Authors

  • Bing Lv

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

  • Bernd Lorenz

    • Department of Physics and TcSUH at the University of Houston
    • Department of Physics, TcSUH, University of Houston
    • Univ of Houston
    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77024-5002, USA
    • Dept. of Physics and TcSUH, University of Houston

  • Melissa Gooch

    • Department of Physics and TcSUH at the University of Houston
    • Dept. of Physics and TcSUH, University of Houston

  • Feng Chen

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

  • Liangzi Deng

    • Department of Physics and TcSUH, University of Houston
    • Dept. of Physics and TcSUH, University of Houston

  • Paul C. W. Chu

    • Texas Center for Superconductivity at University of Houston and Department of Physics,Lawrence Berkeley National Laboratory
    • Department of Physics and TcSUH at the University of Houston; Lawrence Berkeley National Laboratory
    • Department of Physics, TcSUH, University of Houston and Lawrence Berkeley National Laboratory
    • Dept. of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002
    • Univ of Houston
    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77024-5002, USA
    • Department of Physics and TcSUH, University of Houston
    • Dept. of Physics and TcSUH, University of Houston
    • Texas Center for Superconductivity, University of Houston and Lawrence Berkeley National Laboratory