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 GerardSMITH J.l.
Citation: PHYSICAL REVIEW LETTERS vol. 96 p. 125501
Publisher: AMERICAN PHYSICAL SOC
Publication Year: 2006
JRC N°: JRC34403
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC34403
Type: Articles in Journals
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:Institute for Transuranium Elements

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