Formation of a New Dynamical Mode in alpha-Uranium Observed by Inelastic X-Ray and Neutron Scattering

by: ME Manley, M Yethiraj, H Sinn, HM Volz, A Alatas, JC Lashley, WL Hults, GH Lander, JL Smith

Physical Review Letters, Vol. 96, No. 12. (2006)

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摘要

Phonon dispersion curves were obtained from inelastic x-ray and neutron scattering measurements on -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 [00] above 450 K. Above the same temperature a new dynamical mode of comparable intensity emerges along the [01] 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.

@article{citeulike:2758383, abstract = {Phonon dispersion curves were obtained from inelastic x-ray and neutron scattering measurements on -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 [00] above 450\ K. Above the same temperature a new dynamical mode of comparable intensity emerges along the [01] 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.}, author = {Manley, M. E. and Yethiraj, M. and Sinn, H. and Volz, H. M. and Alatas, A. and Lashley, J. C. and Hults, W. L. and Lander, G. H. and Smith, J. L. }, citeulike-article-id = {2758383}, doi = {10.1103/PhysRevLett.96.125501}, journal = {Physical Review Letters}, keywords = {2006, cool, crystal, elasticity, focus}, number = {12}, posted-at = {2008-05-05 17:33:18}, priority = {2}, publisher = {APS}, title = {Formation of a New Dynamical Mode in alpha-Uranium Observed by Inelastic X-Ray and Neutron Scattering}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000096000012125501000001\&idtype=cvips\&gifs=yes}, volume = {96}, year = {2006} }

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TY - JOUR ID - citeulike:2758383 L3 - citeulike-article-id:2758383 TI - Formation of a New Dynamical Mode in alpha-Uranium Observed by Inelastic X-Ray and Neutron Scattering JF - Physical Review Letters VL - 96 IS - 12 PB - APS N2 - Phonon dispersion curves were obtained from inelastic x-ray and neutron scattering measurements on -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 [00] above 450 K. Above the same temperature a new dynamical mode of comparable intensity emerges along the [01] 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. KW - 2006 KW - cool KW - crystal KW - elasticity KW - focus AU - Manley, ME AU - Yethiraj, M AU - Sinn, H AU - Volz, HM AU - Alatas, A AU - Lashley, JC AU - Hults, WL AU - Lander, GH AU - Smith, JL PY - 2006/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000096000012125501000001&idtype=cvips&gifs=yes ER -

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