Abstract
At low temperatures the thermal, elastic and dielectric properties of glasses are known to be determined by low-energy excitations which seem to be intrinsic to the glassy state /1/. Recently measurements of the time dependence of the specific heat /2,3,4/ have shown that some of these excitations relax very slowly into thermal equilibrium. Such a behaviour, especially a logarithmic time dependence of the specific heat, is indeed predicted by the tunneling model /5,6/ which until now was most successful in explaining these low-temperature anomalies. A quantitative analysis of these time-dependent thermal measurements, however, is very difficult and does not allow to unambiguously confirm the predictions of the tunneling model.
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References
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von Schickfus, M., Tietje, H., Gmelin, E. (1986). Very Low Frequency Loss Measurements in Glasses. In: Hartwig, G., Evans, D. (eds) Nonmetallic Materials and Composites at Low Temperatures. Cryogenic Materials Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2010-2_13
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DOI: https://doi.org/10.1007/978-1-4899-2010-2_13
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