Abstract
We investigate the low-frequency enhancement of vibrational excitations (‘bosonpeak’) in niobium-phosphate glasses through the combination of inelasticneutron and polarization-resolved Raman scattering. The spectra of theseglasses reveal an enhancement of the vibrational density of states and of thecross section for spontaneous Raman scattering in the frequency range below150 cm − 1. A recent theoretical model that is based on fluctuating elastic and elasto-optic (Pockels)constants provides a unified description of the measured neutron and Raman spectra,including the depolarization ratio.
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