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Comment on: Low temperature specific heat of blue bronze K0.3MoO3

In our Reply to the Comment [1] we refute the "straightforward" interpretation of the excess low-temperature specific heat, C., contribution we have measured in our study of CDW systems K0.3MoO3 and (TaSe4)(2)I [2] as originating solely from normal phonon modes. The specific sensitivity of the bump in Cp/T-3 at low temperatures to the impurity content is consistent with the increased value of the phason pinning gap while the dispersion of normal phonons remains unaffected. We ascribe at least this part of the anomaly to the phason contribution. As stated in reference [3] that the phonon density of states extracted from neutron scattering measurements is the least reliable in this energy range (<0.5 meV), we conclude that C. measurements are more accurate for detecting the phason contribution.

density-of-states; K0.3moo3; excitations; compound; phase; gap

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