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Incommensurate Systems as Model Compounds for Disorder Revealing Low-Temperature Glasslike Behavior
2015
Physical Review Letters
We show that the specific heat of incommensurately modulated crystals with broken translational periodicity presents similar features at low temperatures to those of amorphous and glass materials. Here we demonstrate that the excess to the constant C p ðTÞ=T 3 law (or Debye limit) is made up of an upturn below 1 K and of a broad bump at T ≈ 10 K that directly originates from the gapped phase and amplitude modes of the incommensurate structure. We argue that the low-energy dynamics of
doi:10.1103/physrevlett.114.195502
pmid:26024180
fatcat:pnxnrg73rnf2zbxhs7ch35ylsy