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

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arxiv 1105.3558 v1 pith:DQ3O3ZQJ submitted 2011-05-18 cond-mat.str-el cond-mat.supr-con

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

S. Raymond , J. Bouchet , G.H. Lander , M. Le Tacon , G. Garbarino , M. Hoesch , J.-P. Rueff , M. Krisch
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J.C. Lashley R.K. Schulze R.C. Albers
This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords pressureuraniumcomplexcouplingdiagramelectron-phononphaseunderstanding
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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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