Dynamic-to-static crossover in the acoustic attenuation of v-GeO 2

G. Baldi*, P. Benassi, L. E. Bove, S. Caponi, E. Fabiani, D. Fioretto, A. Fontana, A. Giugni, M. Nardone, M. Sampoli, F. Scarponi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

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 80 K 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.

Original languageEnglish (US)
Article number36001
JournalEPL
Volume78
Issue number3
DOIs
StatePublished - May 1 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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