Pressure effects on crystal structure and critical temperature in non-centrosymmetric superconductor AuBe

ORAL

Abstract

We investigate the superconducting properties of the non-centrosymmetric AuBe superconductor under pressure. First, we identify possible phase transformations under pressure using the Genetic Algorithm for Structure and Phase Prediction (GASP) coupled to density functional theory calculations. Our calculations reveal several possible stable phases above 50 GPa that exhibit enthalpies below that of the ambient pressure ground-state structure. Out of these predicted stable phases, the phase with the centrosymmetric Cmcm crystal structure shows the lowest enthalpy. Next, we measure the low-temperature resistivity of our sample as a function of pressure to study the effect of pressure on the superconducting properties. We also perform high-pressure X-ray diffraction to verify our predictions of phase transition under pressure.

*Work on this project was supported by the US Department of Energy Basic Energy Sciences under Contract No. DE-SC-0020385. HPXRD supported by the U.S. Department of Energy (DOE) National Nuclear Security Administration (NNSA) through the Chicago/DOE Alliance Center.

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Presenters

  • Ajinkya Hire

    • Department of Materials Science and Engineering, University of Florida

Authors

  • Ajinkya Hire

    • Department of Materials Science and Engineering, University of Florida

  • Jinhyuk Lim

    • Department of Physics, University of Florida

  • Jungsoo Kim

    • University of Florida
    • Department of Physics, University of Florida

  • Yundi Quan

    • Department of Physics, University of Florida

  • ravhi kumar

    • Department of Physics, University of Illinois at Chicago
    • University of Illinois at Chicago

  • Russell Hemley

    • Department of Chemistry, University of Illinois at Chicago

  • Peter Hirschfeld

    • University of Florida
    • Department of Physics, University of Florida
    • Physics, University of Florida
    • univ of Florida

  • James Hamlin

    • Department of Physics, University of Florida
    • University of Florida

  • Gregory Randall Stewart

    • University of Florida
    • Department of Physics, University of Florida

  • Richard Hennig

    • University of Florida
    • Department of Materials Science and Engineering, University of Florida
    • Materials Science and Engineering, University of Florida