Scaling the Temperature-dependent Boson Peak of Vitreous Silica with the high-frequency Bulk Modulus derived from Brillouin Scattering Data

Abstract

The position and strength of the boson peak in silica glass vary considerably with temperature $T$. Such variations cannot be explained solely with changes in the Debye energy. New Brillouin scattering measurements are presented which allow determining the $T$-dependence of unrelaxed acoustic velocities. Using a velocity based on the bulk modulus, scaling exponents are found which agree with the soft-potential model. The unrelaxed bulk modulus thus appears to be a good measure for the structural evolution of silica with $T$ and to set the energy scale for the soft potentials.

Accepted for publication in Physical Review Letters

References in corpus (3)

• Vibrational instability, two-level systems and Boson peak in glasses
• The Boson Peak and its Relation with Acoustic Attenuation in Glasses
• Hypersound damping in vitreous silica measured by picosecond acoustics

Cited by in corpus (10)

• Modeling the mechanics of amorphous solids at different length and time scales
• Low-frequency vibrational modes of stable glasses
• Relation of vibrational excitations and thermal conductivity to elastic heterogeneities in disordered solids
• Vitreous silica distends in helium gas: acoustic vs. static compressibilities
• Pressure-induced densification of vitreous silica: insight from elastic properties
• Poisson ratio and excess low-frequency vibrational states in glasses
• Stringlet Excitation Model of the Boson Peak
• The quasi-low temperature behaviour of specific heat
• Eliminating the broadening by finite aperture in Brillouin spectroscopy
• A self-consistent current response theory of jamming and vibrational modes in low-temperature amorphous solids