Issue |
Europhys. Lett.
Volume 47, Number 4, August II 1999
|
|
---|---|---|
Page(s) | 462 - 467 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i1999-00410-4 | |
Published online | 01 September 2002 |
Anharmonicity of low-frequency vibrations
in a-
studied by light scattering
1
Department of Applied Physics, Hokkaido University - Sapporo 060-8628, Japan
2
Research Institute of Electronic Science, Hokkaido University Sapporo 060-0812, Japan
Received:
17
February
1999
Accepted:
18
June
1999
High-resolution Brillouin and Raman scattering experiments
are carried out
as a function of pressure (from ambient pressure to 26 kbar) for
amorphous germanium disulphide (a-). Large pressure
effects are
observed for the boson peak spectrum. A comparison of
pressure dependences for the boson peak and
the longitudinal acoustic (LA)
mode is made via the effective third-order elastic
stiffness constants determined for both modes.
The results indicate larger anharmonic coupling between the
low-frequency modes responsible for the boson peak spectra and
extended phonons than within extended phonons.
PACS: 63.50.+x – Vibrational states in disordered systems / 78.30.-j – Infrared and Raman spectra / 78.30.Ly – Disordered solids
© EDP Sciences, 1999
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