Pressure dependence of the Boson peak in glassy As2S3 studied by Raman Scattering

Details Pressure dependence of the Boson peak in glassy As2S3 studied by Raman Scattering Pressure dependence of the Boson peak in glassy As2S3 studied by Raman Scattering

2006-03-07

arxiv.org/abs/cond-mat/0603158v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

To appear in J. Non-Cryst. Solids (Proceedings of the 5th IDMRCS, Lille, July 2005)

Scientific paper

10.1016/j.jnoncrysol.2005.12.056

A detailed pressure-dependence study of the low-energy excitations of glassy As2S3 is reported over a wide pressure range, up to 10 GPa. The spectral features of Boson peak are analysed as a function of pressure. Pressure effects on the Boson peak are manifested as an appreciable shift of its frequency to higher values, a suppression of its intensity, as well as a noticeable change of its asymmetry leading to a more symmetric shape at high pressures. The pressure-induced Boson peak frequency shift agrees very well with the predictions of the soft potential model over the whole pressure range studied. As regards the pressure dependence of the Boson peak intensity, the situation is more complicated. It is proposed that in order to reach proper conclusions the corresponding dependence of the Debye density of states must also be considered. Employing a comparison of the low energy modes of the crystalline counterpart of As2S3 as well as the experimental data concerning the pressure dependencies of the Boson peak frequency and intensity, structural or glass-to-glass transition seems to occur at the pressure ~4 GPa related to a change of local structure. Finally, the pressure-induced shape changes of the Boson peak can be traced back to the very details of the excess (over the Debye contribution) vibrational density of states.

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