| Issue |
Europhys. Lett.
Volume 47, Number 1, July 1999
|
|
|---|---|---|
| Page(s) | 56 - 62 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00351-x | |
| Published online | 01 September 2002 | |
The Raman coupling function in amorphous silica and the nature of the long-wavelength excitations in disordered systems
1
Università di Trento and Istituto Nazionale di Fisica della Materia I-38050, Povo, Trento, Italy
2
Università de L'Aquila and Istituto Nazionale di Fisica della Materia I-67100, L'Aquila, Italy
3
Università di Firenze and Istituto Nazionale di Fisica della Materia I-50139, Firenze, Italy
4
Institut für Festkörperforschung, Forschungszentrum Jülich Postfach 1913, D-52425, Jülich, Germany
Received:
21
October
1998
Accepted:
21
April
1999
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 
and, in particular, its low-frequency limit. This study indicates
that in the 
limit extrapolates to a nonvanishing 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
nonregular local atomic displacements.
PACS: 63.50.+x – Vibrational states in disordered systems / 61.43.Fs – Glasses
© EDP Sciences, 1999
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