Formation of a New Dynamical Mode in Alpha-Uranium Observed by Inelastic X-Ray and Neutron Scattering
Phonon dispersion curves were obtained from inelastic x-ray and neutron scattering measurements on alpha-uranium single crystals at temperatures from 298 to 573 K. Both measurements showed a softening and an abrupt loss of intensity in the longitudinal optic branch along above 450 K. Above the same
temperature a new dynamical mode of comparable intensity emerges along the zone boundary with energy near the top of the phonon spectrum. The new mode forms without a structural transition but coincides with an anomaly in the mechanical deformation behavior. We argue that the mode is an
intrinsically localized vibration and formed as a result of a strong electron-phonon interaction.
MANLEY M.E.;
YETHIRAJ M.;
SINN H.;
VOLZ H.M.;
ALATAS A.;
LASHLEY J.C.;
HULTS W.L.;
LANDER Gerard;
SMITH J.L.;
2006-08-16
AMERICAN PHYSICAL SOC
JRC34403
https://publications.jrc.ec.europa.eu/repository/handle/JRC34403,
10.1103/PhysRevLett.96.125501,
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