The authors report new angle-dependent light scattering spectra and thermal diffusivity data in BaMnF 4 which show that the light scattering central peak recently reported (1979) may be interpreted as phason scattering. The thermal diffusivity measurements demonstrate that the peak is not due to entropy fluctuation scattering. This interpretation provides evidence for a strong anisotropy in the phason dispersion, as suggested by theory.
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Lyons et al. (1980) studied this question.
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