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

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

2004-04-19

arxiv.org/abs/cond-mat/0404437v3

Phys. Rev. Lett. 93, 245902 (2004).

Physics

Condensed Matter

Statistical Mechanics

9 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.93.245902

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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