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We report the results of an inelastic neutron scattering study of the lattice vibration spectra in the normal and incommensurate phases of (ClC₆D₄)₂SO₂. Because of unusually low soft mode damping, a finite value of the phason frequency at the satellite position is observed for the first time. The soft mode frequency saturation in the normal phase and this phason gap are consistent with the dynamical nature of the observed central peak.
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Ollivier et al. (1998) studied this question.
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