Dynamic sound attenuation at hypersonic frequencies in silica glass

Details Dynamic sound attenuation at hypersonic frequencies in silica glass Dynamic sound attenuation at hypersonic frequencies in silica glass

2006-01-05

arxiv.org/abs/cond-mat/0601096v1

Physical Review B 73 (2006) 0652201

Physics

Condensed Matter

Disordered Systems and Neural Networks

Scientific paper

10.1103/PhysRevB.73.052202

In order to clarify the origin of the dominant processes responsible for the acoustic attenuation of phonons, which is a much debatted topic, we present Bril louin scattering experiments in various silica glasses of different OH impurities content. A large temperature range, from 5 to 1500 K is investigated, up to the glass transition temperature. Comparison of the hypersonic wave attenuation in various samples allows to identify two different processes. The first one induce s a low temperature peak related to relaxational processes; it is strongly sensitive to the extrinsic defects. The second, dominant in the hig h temperature range, is weakly dependent on the impurities and can be ascribed to anharmonic interactions.

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