title: 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.
authors.affiliation: Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS Université Montpellier II, F-34095 Montpellier Cedex 5, France.
authors.forename: B
authors.initials: B
authors.lastname: Rufflé
authors.forename: S
authors.initials: S
authors.lastname: Ayrinhac
authors.forename: E
authors.initials: E
authors.lastname: Courtens
authors.forename: R
authors.initials: R
authors.lastname: Vacher
authors.forename: M
authors.initials: M
authors.lastname: Foret
authors.forename: A
authors.initials: A
authors.lastname: Wischnewski
authors.forename: U
authors.initials: U
authors.lastname: Buchenau