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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Discovery of near room temperature superconductivity in clathrate hydrides.
  • Electron-phonon mediated superconductivity in these materials is linked to proton mass.
  • Proton dynamics' role in superconductivity remains an open question.

Purpose of the Study:

  • Investigate proton dynamics in clathrate superhydrides.
  • Understand the relationship between proton diffusion and superconductivity.
  • Examine the Li_{2}MgH_{16} system as a model.

Main Methods:

  • Ab initio path integral simulations.
  • Analysis of proton diffusion coefficients.
  • Study of proton transfer mechanisms.

Main Results:

  • Demonstrated remarkably high proton diffusion in Li_{2}MgH_{16} at 300 K and 250 GPa.
  • Diffusion coefficient reached 6×10^{-6} cm²/s.
  • Proton transfer occurred via interstitial voids within the Li_{2}Mg sublattice.

Conclusions:

  • Proton quantum diffusion coexists with hydrogen-induced superconductivity.
  • Findings have implications for understanding very-high-temperature superconducting hydrides.
  • Highlights the importance of quantum effects in novel superconducting materials.