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Abstract
New temperature-dependent Brillouin and Raman scattering experiments were performed on vitreous GeO2 in the 10–1200 K temperature range. We found that, while the sound velocity above room temperature slightly increases (2–3%), the frequency of the Boson peak maximum shows unexpected behavior, decreasing by more than 15% when the temperature is increased. The results are interpreted in the framework of a phenomenological model.