Precise low-frequency internal friction measurements on vitreous silica, taken over a wide temperature (4 K < T < 300 K) and frequency range (40 Hz < nu < 14 kHz), show remarkable similarities, but also suggestive differences with recent light-scattering experiments. In the interval 30 K < T < 110 K, the exponent alpha(T) of the power-law relaxational spectrum at low frequencies turns out to be proportional to T - T(k), with a minimum at around T(k) = 13 K. This phenomenon is interpreted as a manifestation of quenched spatial disorder. (C) 2009 Elsevier B.V. All rights reserved.
Low-frequency losses in silica glass at low temperature
TRAVASSO, FLAVIO;GAMMAITONI, Luca;VOCCA, Helios;
2009
Abstract
Precise low-frequency internal friction measurements on vitreous silica, taken over a wide temperature (4 K < T < 300 K) and frequency range (40 Hz < nu < 14 kHz), show remarkable similarities, but also suggestive differences with recent light-scattering experiments. In the interval 30 K < T < 110 K, the exponent alpha(T) of the power-law relaxational spectrum at low frequencies turns out to be proportional to T - T(k), with a minimum at around T(k) = 13 K. This phenomenon is interpreted as a manifestation of quenched spatial disorder. (C) 2009 Elsevier B.V. All rights reserved.File in questo prodotto:
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