Formation of a new dynamical mode in -uranium observed by inelastic x-ray and neutron scattering |
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Authors: | Manley M E Yethiraj M Sinn H Volz H M Alatas A Lashley J C Hults W L Lander G H Smith J L |
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Affiliation: | Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. |
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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 [00zeta] above 450 K. Above the same temperature a new dynamical mode of comparable intensity emerges along the [01zeta] 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. |
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