Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2003-01-24
J. Phys. - Condens Mat. 15, S1279 (2003)
Physics
Condensed Matter
Disordered Systems and Neural Networks
14 pages, 6 figures, to be published in a special issue of J. Phys. Condens. Matter
Scientific paper
10.1088/0953-8984/15/11/346
Spectroscopic results on low frequency excitations of densified silica are presented and related to characteristic thermal properties of glasses. The end of the longitudinal acoustic branch is marked by a rapid increase of the Brillouin linewidth with the scattering vector. This rapid growth saturates at a crossover frequency Omega_co which nearly coincides with the center of the boson peak. The latter is clearly due to additional optic-like excitations related to nearly rigid SiO_4 librations as indicated by hyper-Raman scattering. Whether the onset of strong scattering is best described by hybridization of acoustic modes with these librations, by their elastic scattering (Rayleigh scattering) on the local excitations, or by soft potentials remains to be settled.
Courtens E.
Foret Marie
Hehlen B.
Rufflé B.
Vacher René
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