Pressure-induced superconductivity in novel polymorphic phase of BaCu<sub>2</sub>As<sub>2 </sub>(Z=10)

ORAL

Abstract

High-pressure electrical transport studies up to 60 GPa have been conducted on a completely new polymorphic phase of BaCu2As2 (β-BaCu2As2), in which the number of formula units Z is 10. A superconducting phase was detected at pressure above 19 GPa with the highest Tc of 7.2 K observed at 24 GPa. Two additional superconducting phases were also observed at a lower pressure range, but their respective pressure dependences are very similar to those of superconducting phases in elemental Sn, which served as the flux for growing the single-crystal β-BaCu2As2. Our high-pressure electrical transport measurements of Sn show that no new superconducting phase exists at pressure above 19 GPa and other known possible superconducting impurities are excluded as well.

*The work performed at TcSUH is supported by US Air Force Office of Scientific Research Grants 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

  • Zheng Wu

    • 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

  • Zheng Wu

    • 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

  • 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

  • Shuyuan Huyan

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

  • Paul C. W. Chu

    • 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

  • Hanlin Wu

    • Department of Physics, University of Texas at Dallas
    • Physics, The University of Texas at Dallas
    • Department of Physics, The University of Texas at Dallas

  • Sheng Li

    • Department of Physics, University of Texas at Dallas
    • Physics, The University of Texas at Dallas
    • Department of Physics, The University of Texas at Dallas

  • Bing Lv

    • The University of Texas at Dallas
    • Department of Physics, University of Texas at Dallas
    • Physics, The University of Texas at Dallas
    • Department of Physics, The University of Texas at Dallas
    • University of Texas at Dallas