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

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

2011-05-18

arxiv.org/abs/1105.3558v1

Phys. Rev. Lett. 107, 136401 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.107.136401

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.

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