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Anharmonicity of low-frequency vibrations in a-GeS2 studied by light scattering

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-GeS2). 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.