Acoustic Nature of the Boson Peak in Vitreous Silica

Details Acoustic Nature of the Boson Peak in Vitreous Silica Acoustic Nature of the Boson Peak in Vitreous Silica

1999-11-02

arxiv.org/abs/cond-mat/9911022v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

10 pages and 4 figures

Scientific paper

New temperature dependent inelastic x-ray (IXS) and Raman (RS) scattering data are compared to each other and with existing inelastic neutron scattering data in vitreous silica (v-SiO_2), in the 300 - 1775 K region. The IXS data show collective propagating excitations up to Q=3.5 nm^-1. The temperature behaviour of the excitations at Q=1.6 nm^-1 matches that of the boson peak found in INS and RS. This supports the acoustic origin of the excess of vibrational states giving rise to the boson peak in this glass.

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