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We report the first very low temperature (from 93 mK to 7.3 K) specific heat data of a modulated incommensurate dielectric (ClC₆{H}₄)₂SO₂. They reveal three different contributions in excess of that of normal acoustic phonons: low frequency excitations predominant below 0.2 K, a phason branch above 0.7 K, and optical phonon and amplitudon branches around 4.5 K. This analysis is done considering neutron scattering results also.
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Etrillard et al. (1996) studied this question.
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