Volume 47, Number 4, August II 1999
|Page(s)||462 - 467|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Anharmonicity of low-frequency vibrations in a- studied by light scattering
Department of Applied Physics, Hokkaido University - Sapporo 060-8628, Japan
2 Research Institute of Electronic Science, Hokkaido University Sapporo 060-0812, Japan
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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