Abstract
We discuss heat capacity properties of several commonly investigated CDW systems, the members of the transition metal chalcogenide family : NbSe 3, TaS 3 and (TaSe 4 2I. Several observed effects can be ascribed to the disorder of CDWs: hysteresis below the Peierls transition, a contribution to the specific heat from low-energy excitations of metastable CDW states (C p ≈ T α , α ⩽ 1) as well as the failure of ergodicity via non-exponential thermal relaxation below some temperature T < 1 K. We show that the similarity in the thermal properties with other glassy systems may also be established at very low temperatures. The phason contribution to the specific heat anomaly observed in (TaSe 4) 2I at 1.75 K is also discussed.
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