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An explanation for the glass-like anomaly in the low-temperature specific heat of incommensurate phases

A. Cano·A. P. Levanyuk
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Abstract

An explanation for the glass-like anomaly observed in the low-temperature specific heat of incommensurate phases is proposed. The key point of this explanation is the proper account for the phason damping when computing the thermodynamic magnitudes. The low-temperature specific heat of the incommensurate phases is discussed within three possible scenarios for the phason dynamics: no phason gap, static phason gap and a phason gap of dynamical origin. Existing NMR and inelastic scattering data indicate that these scenarios are possible in biphenyl, blue bronze $\rm K_{0.30}MoO_3$ and BCPS respectively. Estimates of the corresponding low-temperature specific heat are in reasonable agreement with the experiments.

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A. Cano, A. P. Levanyuk. 2004-12-09. An explanation for the glass-like anomaly in the low-temperature specific heat of incommensurate phases. https://doi.org/10.1103/physrevlett.93.245902

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