The Raman coupling function in amorphous silica and the nature of the long wavelength excitations in disordered systems

Details The Raman coupling function in amorphous silica and the nature of the long wavelength excitations in disordered systems The Raman coupling function in amorphous silica and the nature of the long wavelength excitations in disordered systems

1999-11-16

arxiv.org/abs/cond-mat/9911237v1

Europhysics Letters 47, 56 (1999)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Revtex, 4 ps figures

Scientific paper

10.1209/epl/i1999-00351-x

New Raman and incoherent neutron scattering data at various temperatures and molecular dynamic simulations in amorphous silica, are compared to obtain the Raman coupling coefficient $C(\omega)$ and, in particular, its low frequency limit. This study indicates that in the $\omega \to 0$ limit $C(\omega)$ extrapolates to a non vanishing value, giving important indications on the characteristics of the vibrational modes in disordered materials; in particular our results indicate that even in the limit of very long wavelength the local disorder implies non-regular local atomic displacements.

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