Sound attenuation in an unexplored frequency region: Brillouin Ultraviolet Light Scattering measurements in v-SiO2
Abstract
We report Ultraviolet Brillouin light scattering experimental data on v-SiO2 in an unexplored frequency region, performed with a newly available spectrometer up to exchanged wavevector q values of 0.075 nm^{-1}, as a function of temperature. The measured attenuation scales on visible data following a q^2 behavior and is temperature-dependent. Such temperature dependence is found in a good agreement with that measured at lower q, suggesting that its origin is mainly due to a dynamic attenuation mechanism. The comparison between the present data with those obtained by Inelastic X-ray Scattering suggests the existence of a cross-over to a different attenuation regimes.
- Publication:
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arXiv e-prints
- Pub Date:
- July 2004
- DOI:
- 10.48550/arXiv.cond-mat/0407476
- arXiv:
- arXiv:cond-mat/0407476
- Bibcode:
- 2004cond.mat..7476B
- Keywords:
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- Condensed Matter - Disordered Systems and Neural Networks
- E-Print:
- 4 pages, 3 figures