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Lattice dynamics of uranium chalcogenides and pnictides.

Phonon dispersion relations in uranium chalcogenides and pnictides have been investigated with use of a three-body-force rigid-ion model that includes long-range three-body interactions due to charge-transfer effects. The dispersion curves for optical branches in almost all symmetry directions and the acoustic branches along the A directions are reproduced fairly well. The force constants derived from our theory follow a similar trend, as is revealed from an experimental fit with the rigid-ion model. The contribution of three-body interactions at the L point is significant