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Comment on “Explanation of the Glasslike Anomaly in the Low-Temperature Specific Heat of Incommensurate Phases”

Recently Cano and Levanyuk proposed an attractive conjecture for explaining the glasslike anomaly in specific heat at low temperature (low-T Cp) of incommensurate (IC) phases based on the phason damping [1]. The universal features of glasses, i.e., the bump in Cp=T3 and the quasilinear (or power-law) contribution
Cp
T
have also been found in low-T Cp of charge density wave(CDW) systems [2], which can be related to the glass transition in the CDW superstructure observed in dielectric spectroscopy [3]. The CDW pinning resonance, i.e., the phason gap, was considered as analogous to the wellknown boson peak found in glasses [3]. Moreover, we have been able to explain the bump in Cp=T3 using a modified model of the gapped or pinned phason which, however, neglects the phason damping. The explanation of the quasilinear contribution to Cp in terms of damping urged us to check the applicability to CDW systems which can be considered as canonical IC example. In the following we show that the theory presented in [1] is still not suitable to explain the quasilinear contribution to Cp in IC systems.

glass ; incommensurate phase ; specific heat ; anomaly

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