Damping of sound waves in the terahertz range and strength of the boson peak

Livia E. Bove, C. Petrillo, A. Fontana, A. P. Sokolov

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

By applying a new two-step line-shape analysis to inelastic neutron and x-ray scattering spectra of glassy systems, we were able to resolve the acoustic excitations from the low-frequency excess modes and to accurately estimate the damping of sound waves in the terahertz frequency range. Using this approach, we estimated the damping parameter for terahertz acoustic waves in a wide class of chemically different glasses and did a quantitative comparison of the results with prediction of theoretical models. By comparing the estimates of the mean-free path of the acoustic modes in different glasses and the corresponding boson peak strengths, we show the existence of a simple correlation between these two quantities. The relationship between attenuation of the terahertz acoustic modes, strength of the boson peak, and fragility is discussed.

Original languageEnglish
Article number184502
JournalJournal of Chemical Physics
Volume128
Issue number18
DOIs
StatePublished - 2008
Externally publishedYes

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