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|Title:||Formation of a New Dynamical Mode in Alpha-Uranium Observed by Inelastic X-Ray and Neutron Scattering|
|Authors:||MANLEY M.e.; YETHIRAJ M.; SINN H.; VOLZ H.m.; ALATAS A.; LASHLEY J.c.; HULTS W.l.; LANDER Gerard; SMITH J.l.|
|Citation:||PHYSICAL REVIEW LETTERS vol. 96 p. 125501|
|Publisher:||AMERICAN PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||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.|
|JRC Institute:||Nuclear Safety and Security|
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