New ternary lanthanum superhydrides under pressure

ORAL

Abstract

The discovery of room-temperature superconductivity in lanthanum superhydride LaH10 may be understood in terms of the stabilization of a dense hydrogen cage structure with doping of B or N. We report experimental results for La-Y-H, La-Al-H, La-Nd-H, and La-C-H ternary hydrides at megabar pressures. Structures are identified on the basis of x-ray diffraction measurements, along with measurements of Tc from electrical conductivity. In particular, a cubic carbon-doped lanthanum hydride (La1-nCnHx) has been identified at megabar pressures.

*US NSF (DMR-2104881) & DOE/NNSA (DE-NA0003975)

–

Presenters

  • Abdul Haseeb Manayil Marathamkottil

    • University of Illinois at Chicago

Authors

  • Abdul Haseeb Manayil Marathamkottil

    • University of Illinois at Chicago

  • NILESH P SALKE

    • University of Illinois Chicago

  • Muhtar Ahart

    • University of Illinois at Chicago
    • Carnegie Inst of Washington
    • University of Illinois Chicago
    • Department of Physics, University of Illinois at Chicago

  • Yue Meng

    • Argonne National Laboratory
    • HPCAT, X-ray Science Division, Argonne National Laboratory

  • Maddury Somayazulu

    • Argonne National Laboratory
    • HPCAT, X-Ray Science Division, Argonne National Laboratory

  • Russell J Hemley

    • University of Illinois at Chicago
    • University of Illinois Chicago
    • Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois Chicago
    • Department of Physics and Chemistry, University of Illinois Chicago, 845, W. Taylor Street, Chicago, IL 60607
    • Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois at Chicago