Ref HAL: hal-00512621_v1
PMID 20366853
DOI: 10.1103/PhysRevLett.104.067402
WoS: 000274445100047
Exporter : BibTex | endNote
46 Citations
Résumé:

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.