Understanding the complex phase diagram of uranium: the role of electron-phonon coupling

Abstract

We report an experimental determination of the dispersion of the soft phonon mode along [1,0,0] in uranium as a function of pressure. The energies of these phonons increase rapidly, with conventional behavior found by 20 GPa, as predicted by recent theory. New calculations demonstrate the strong pressure (and momentum) dependence of the electron-phonon coupling, whereas the Fermi-surface nesting is surprisingly independent of pressure. This allows a full understanding of the complex phase diagram of uranium, and the interplay between the charge-density wave and superconductivity.

References in corpus (6)

• Superconductivity in Cu_xTiSe_2
• Fermi surface nesting and the origin of Charge Density Waves in metals
• Electron-phonon interactions and related physical properties of metals from linear-response theory
• Charge density wave and superconducting dome in TiSe2 from electron-phonon interaction
• Linear-Response Calculation of Electron-Phonon Coupling Parameters
• Fermi Surface of Alpha-Uranium at Ambient Pressure

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• Lattice dynamics and elastic properties of alpha-U at high-temperature and high-pressure by machine learning potential simulations
• The malleability of uranium: manipulating the charge-density wave in epitaxial films
• Inelastic X-ray scattering studies of phonon dispersions in superconductors at high pressures
• On the Ground State of the U-Mo System
• Lifshitz transition enabling superconducting dome around the quantum critical point in TiSe${}_2$
• The high-pressure phase diagram of BaNi${}_2$As${}_2$: unconventional charge-density-waves and structural phase transitions
• Electron-phonon coupling in EuAl4 under hydrostatic pressure
• Effect of strain on charge density wave order in α-U