High Pressure study of low-Z superconductor Be<sub>22</sub>Re

ORAL

Abstract

With Tc ∼9.6 K, Be22Re exhibits one of the highest critical temperatures among Be-rich compounds. We have carried out a series of high pressure electrical resistivity measurements to 30 GPa. The data show that the critical temperature Tc is suppressed gradually at a rate of dTc/dP = –0.05 K/GPa. Density functional theory calculations demonstrate a corresponding increase in the density of states at the Fermi level. Together, these results indicate that the electron-phonon coupling decreases with pressure. We discuss the relationship between low-Z Be-rich superconductors and the high-Tc superhydrides.

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

–

Presenters

  • Jinhyuk Lim

    • Department of Physics, University of Florida

Authors

  • Jinhyuk Lim

    • Department of Physics, University of Florida

  • Ajinkya Hire

    • Department of Materials Science and Engineering, University of Florida

  • Yundi Quan

    • Physics Department, University of Florida
    • Department of Physics, University of Florida
    • University of California, Davis

  • Jungsoo Kim

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

  • Laura Fanfarillo

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

  • Stephen Raymond Xie

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

  • Richard Hennig

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

  • Peter Hirschfeld

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

  • Gregory Randall Stewart

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

  • James Hamlin

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