Spectral Shape of Relaxations in Silica Glass

Details Spectral Shape of Relaxations in Silica Glass Spectral Shape of Relaxations in Silica Glass

1999-10-22

arxiv.org/abs/cond-mat/9910347v3

Phys. Rev. Lett., 84, 2718 (2000)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.84.2718

Precise low-frequency light scattering experiments on silica glass are presented, covering a broad temperature and frequency range (9 GHz < \nu < 2 THz). For the first time the spectral shape of relaxations is observed over more than one decade in frequency. The spectra show a power-law low-frequency wing of the relaxational part of the spectrum with an exponent $\alpha $ proportional to temperature in the range 30 K < T < 200 K. A comparison of our results with those from acoustic attenuation experiments performed at different frequencies shows that this power-law behaviour rather well describes relaxations in silica over 9 orders of magnitude in frequency. These findings can be explained by a model of thermally activated transitions in double well potentials.

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