Pressure-Induced Superconductivity in Eu<sub>x</sub>Ca<sub>1-x</sub>Fe<sub>2</sub>As<sub>2</sub> Single Crystals

ORAL

Abstract

We have carried out systematic electrical transport and magnetic properties of EuxCa1-xFe2As2 (ECFA) single crystals. The resistance shows a clear anomaly due to the spin-density wave (SDW) at TSDW ~ (165-190 K) and it varies systematically with the doping level (x). There exists another transition at low-temperature TN ~ (15-20 K) due to the antiferromagnetic order of Eu2+ spins. TN also shows a systematic dependence with x. At ambient pressure, none of the ECFA samples show superconducting properties. Therefore, we have used a high-pressure technique to induce superconductivity, and superconductivity with Tc ~ 19 K is induced under ~19 kbar applied pressure. The pressure dependence of Tc and pressure-temperature phase diagram will be discussed.

*This work is supported in part by the U.S. 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. The research at UT Dallas is supported by the U.S. Air Force Office of Scientific Research Grant No. FA9550-19-1-0037. The work at West Texas A&M University is supported by the start-up grant from the Paul Engler College of Agriculture and Natural Sciences.

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Presenters

  • Keshav Shrestha

    • West Texas State Univ
    • Chemistry and Physics, West Texas A&M Univ
    • Chemistry and Physics, West Texas A&M University
    • Florida State University

Authors

  • Keshav Shrestha

    • West Texas State Univ
    • Chemistry and Physics, West Texas A&M Univ
    • Chemistry and Physics, West Texas A&M University
    • Florida State University

  • 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

  • Kui Zhao

    • University of Houston, Texas Center for Superconductivity

  • Ben I Jawdat

    • Department of Materials Science and NanoEngineering, Rice University

  • 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

  • Bernd Lorenz

    • Texas Center for Superconductivity, University of Houston
    • University of Houston, Texas Center for Superconductivity

  • 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