Journal
PHYSICAL REVIEW B
Volume 66, Issue 13, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.66.132302
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The phason origin of the quasielastic diffuse scattering in the incommensurate phase of thiourea is demonstrated by inelastic neutron scattering on a deuterated crystal. The analysis of its frequency spectrum allows one to draw the dispersion of the phason relaxational frequency along the modulation direction. Results indicate that the lowest-frequency mode seen in submillimeter infrared spectra is an overdamped inhomogeneous phason mode corresponding to the antiphase motion of the nearest-neighbor nodes of the modulation profile.
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