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Abstract
Polarised Raman study of the amplitudon mode in the deuterated thiourea enabled us to determine temperature dependence of both damping and frequency of the amplitudon mode. In combination with recent inelastic neutron scattering experiment [J. Hlinka, J. Petzelt, B. Brezina and R. Currat: Phys. Rev. B 66, 132302 (2002).], the dispersion of the phason mode oscillatory frequency could be estimated.