The recently developed technique of Brillouin ultraviolet scattering is used to measure phonon dispersion and damping in the prototypical strong glass v-SiO2. Results on the low temperature (T similar to 10-100 K) sound attenuation at a frequency of similar to 66GHz are presented. The comparison between a model, which takes into account dynamical processes (thermally activated relaxations and the interaction with the bath of thermal vibrations), and the experimental data indicates the presence of a strong static contribution in the region explored by Ultraviolet radiation, supporting the presence of a transition between static and dynamic attenuation mechanisms at a frequency of similar to 100GHz.

Low-temperature phonon damping in vitreous silica explored by UV Brillouin spectroscopy / G. Baldi, S. Caponi, A. Fontana, P. Benassi, A. Giugni, M. Nardone, M. Sampoli. - In: PHILOSOPHICAL MAGAZINE. - ISSN 1478-6435. - 87:3-5(2007), pp. 603-612. ((Intervento presentato al 10. convegno International Workshop on Disordered Systems Moveno-Andalo tenutosi a Trento nel 2006 [10.1080/14786430600891360].

Low-temperature phonon damping in vitreous silica explored by UV Brillouin spectroscopy

A. Giugni;
2007

Abstract

The recently developed technique of Brillouin ultraviolet scattering is used to measure phonon dispersion and damping in the prototypical strong glass v-SiO2. Results on the low temperature (T similar to 10-100 K) sound attenuation at a frequency of similar to 66GHz are presented. The comparison between a model, which takes into account dynamical processes (thermally activated relaxations and the interaction with the bath of thermal vibrations), and the experimental data indicates the presence of a strong static contribution in the region explored by Ultraviolet radiation, supporting the presence of a transition between static and dynamic attenuation mechanisms at a frequency of similar to 100GHz.
Fused quartz; attenuation; scattering; glasses; vibrations; waves; modes; SIO2
Settore FIS/03 - Fisica della Materia
20-lug-2006
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/827930
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