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Article Dans Une Revue EPL - Europhysics Letters Année : 2007

Dynamic-to-static crossover in the acoustic attenuation of v-GeO2

Résumé

The acoustic attenuation of vitreous germania (v-GeO2) has been measured over more than three decades in frequency, by means of neutron scattering at high-frequency (THz), visible light scattering and the newly developed technique of Brillouin ultraviolet scattering at lower frequencies (15-50 GHz). The experiments are supported by a molecular dynamics study of a simulated sample of v-GeO2. The temperature dependence, from 80K up to the glass transition temperature, shows a persistence of the dynamical nature of the attenuation in the GHz range and a simultaneous increase of the contribution coming from the structural disorder. At higher frequencies clear evidences of a crossover to a region where the attenuation is induced only by the topological disorder are found.

Dates et versions

hal-00643094 , version 1 (21-11-2011)

Identifiants

Citer

G. Baldi, P. Benassi, L. E. Bove, S. Caponi, Elisa Fabiani, et al.. Dynamic-to-static crossover in the acoustic attenuation of v-GeO2. EPL - Europhysics Letters, 2007, 78, pp.36001. ⟨10.1209/0295-5075/78/36001⟩. ⟨hal-00643094⟩
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