| Issue |
Europhys. Lett.
Volume 54, Number 1, April 2001
|
|
|---|---|---|
| Page(s) | 77 - 83 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00231-y | |
| Published online | 01 December 2003 | |
Contrasting behaviour of acoustic modes in network and non-network glasses
1
Department of Applied Physics,
Chalmers University of Technology S-412 96 Göteborg, Sweden
2
Università di L'Aquila and INFM - I-67100, L'Aquila, Italy
3
European Synchrotron Radiation Facility -
B.P. 220 F-38043 Grenoble Cedex, France
Corresponding author: matic@fy.chalmers.se
Received:
25
August
2000
Accepted:
25
January
2001
High-frequency acoustic excitations have been investigated in
typical network and non-network glasses, 
and
1.4 (CKN) using inelastic
X-ray scattering. CKN exhibits linear dispersion of the
excitations throughout the investigated range (1-8
)
and to energies more than five times above the boson peak energy.
For we observe for the first time a clear crossover
in the dispersion relation just above the boson peak. The
contrasting behaviour is attributed to differences in
connectivity and fluctuations of force constants on a mesoscopic
length scale.
PACS: 63.50.+x – Vibrational states in disordered systems / 61.10.Eq – X-ray scattering (including small-angle scattering) / 78.70.Ck – X-ray scattering
© EDP Sciences, 2001
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