The Raman coupling function in disordered solids: a light and neutron scattering study on glasses of different fragility

TL;DR

This study investigates the Raman coupling function in various glasses using light and neutron scattering, revealing a linear behavior near the Boson peak and linking vibrational and relaxational properties across different fragility levels.

Contribution

It provides new experimental data on the Raman coupling function in glasses with varying fragility, highlighting a linear trend near the Boson peak and correlating vibrational and relaxational behaviors.

Findings

Linear behavior of $C()$ near the Boson peak

Correlation between vibrational and relaxational properties

Consistent results across different fragility glasses

Abstract

We report new inelastic Raman and neutron scattering spectra for glasses with different degrees of fragility; the data are compared for each sample to obtain the Raman coupling function $C(\omega)$. The study indicates a general linear behaviour of the $C(\omega)$ near the Boson peak maximum, and evidence a correlation between vibrational and relaxational properties, already observed in recent publications.