Abstract
We have measured the long time (t = 5 to 200 h) heat release of Polymethylmethacrylate (PMMA) and Polystyrene (PS) at 70 mK ⩽T ⩽ 300 mK. After cooling from a “charging” temperature of 80 K the heat release in PMMA shows a t−1 dependence in the measured time and temperature ranges in agreement with the tunneling model. In contrast, for PS we observe strong deviations from at −1 dependence and a factor of ten smaller heat release than in PMMA in apparent contradiction to specific heat and thermal conductivity data for PS. To compare the heat release with other low temperature properties and to verify the consistency of the tunneling model we have measured also the acoustical properties (sound velocity and attentuation), the specific heat and the thermal conductivity of PMMA and PS in the temperature range 70mK⩽T⩽ 100 mK, 70mK⩽T⩽200 mK and 0.3 K⩽T⩽4K, respectively. We show that the anomalous time dependence of the heat release of PS is due to the thermally activated relaxation of energy states with excitation energies above 15 K.
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Nittke, A., Scherl, M., Esquinazi, P. et al. Low temperature heat release, sound velocity and attenuation, specific heat and thermal conductivity in polymers. J Low Temp Phys 98, 517–547 (1995). https://doi.org/10.1007/BF00752280
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DOI: https://doi.org/10.1007/BF00752280