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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
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Electronic correlations in uranium hydride UH5under pressure.

Alexey O Shorikov1,2,3, Sergey L Skornyakov1,2,3, Vladimir I Anisimov1,2,3

  • 1M N Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg 620108, Russia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 23, 2020
PubMed
Summary

Calculations reveal that uranium hydride UH5 exhibits moderate electron correlations and significant Fermi surface changes under pressure. These findings suggest potential unconventional pairing mechanisms for superconductivity in uranium hydrides.

Keywords:
Lifshitz transitionelectron correlation effectshigh pressureuranium hydrides

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Uranium-based hydrides are a family of compounds with potential superconducting properties.
  • Previous investigations focused on electron-phonon pairing mechanisms in these materials.

Purpose of the Study:

  • To investigate the electronic structure of uranium hydride (UH5) under pressure.
  • To explore the influence of electron correlations on the electronic properties and Fermi surface topology.
  • To identify potential unconventional pairing mechanisms for superconductivity.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Dynamical Mean-Field Theory (DMFT) for electronic structure.
  • Analysis of Fermi surface topology and electronic mass enhancement.

Main Results:

  • Moderate Coulomb correlation strength indicated by effective electronic mass enhancement (m*/m ~ 1.4).
  • Significant changes in Fermi surface topology due to correlation effects.
  • Splitting of an hourglass-like pocket into two elliptical pockets.

Conclusions:

  • Electron correlations play a crucial role in modifying the electronic structure of UH5.
  • The observed Fermi surface changes suggest the possibility of unconventional pairing mechanisms beyond electron-phonon interactions.
  • This study opens new avenues for understanding superconductivity in uranium hydrides.