Lattice Vibrations in Alpha-Uranium - Non-Linearity and Localization
Non-linearity refers to a situation where small perturbations cause large shifts in the
excitation spectrum. By this definition the phonons in α-uranium are quite non-linear, the
phonon DOS can soften by as much as 10% when the temperature changes by as little as
100 K [1]. Although thermal softening is an expected consequence of anharmonicity, α-
uranium is unusual in that it does not show behavior typically associated with a strongly
anharmonic solid. First, the elastic energy of expansion can only account for about 10%
of the observed softening
MANLEY M.E.;
YETHIRAJ M.;
SINN H.;
VOLZ H.M.;
ALATAS A.;
LASHLEY J.C.;
HULTS W.L.;
LANDER Gerard;
SMITH J.L.;
2007-01-10
U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory
JRC35866
https://publications.jrc.ec.europa.eu/repository/handle/JRC35866,
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