# Hydrogen Clathrate Structures in Rare Earth Hydrides at High Pressures: Possible Route to Room-Temperature Superconductivity

“Hydrogen Clathrate Structures in Rare Earth Hydrides at High Pressures: Possible Route to Room-Temperature Superconductivity” (2017), by Feng Peng et al. Earth and Planetary Sciences research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: Feng Peng, Ying Sun, Chris J. Pickard, Richard J. Needs, Qiang Wu, Yanming Ma
- Published: September 8, 2017
- Field: Earth and Planetary Sciences
- DOI: https://doi.org/10.1103/physrevlett.119.107001
- Source: https://doi.org/10.1103/physrevlett.119.107001

## Abstract

Room-temperature superconductivity has been a long-held dream and an area of intensive research. Recent experimental findings of superconductivity at 200 K in highly compressed hydrogen (H) sulfides have demonstrated the potential for achieving room-temperature superconductivity in compressed H-rich materials. We report first-principles structure searches for stable H-rich clathrate structures in rare earth hydrides at high pressures. The peculiarity of these structures lies in the emergence of unusual H cages with stoichiometries H₂₄, H₂₉, and H₃₂, in which H atoms are weakly covalently bonded to one another, with rare earth atoms occupying the centers of the cages. We have found that high-temperature superconductivity is closely associated with H clathrate structures, with large H-derived electronic densities of states at the Fermi level and strong electron-phonon coupling related to the stretching and rocking motions of H atoms within the cages. Strikingly, a yttrium (Y) H₃₂ clathrate structure of stoichiometry YH₁₀ is predicted to be a potential room-temperature superconductor with an estimated T_c of up to 303 K at 400 GPa, as derived by direct solution of the Eliashberg equation.

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