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Identification of a phason heat capacity in the low-temperature specific heat of potassium
Phys. Rev. B 26, 2720 – Published 15 September, 1982
DOI: https://doi.org/10.1103/PhysRevB.26.2720
Abstract
The low-temperature specific heat of potassium has been remeasured in the temperature range 0.5-5 K. An anomaly located around 1 K is identified as a phason-heat-capacity contribution. The fraction of phonons converted to phasons is 2× and the Debye temperature of these phasons is 6 K. Two independent measurements of the same potassium sample show a difference of 2% in total specific heat but both sets show the same phason anomaly around 1 K.
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