Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2010-01-25
Phys. Rev. Lett. 104, 067402 (2010)
Physics
Condensed Matter
Disordered Systems and Neural Networks
Accepted for publication in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.104.067402
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.
Ayrinhac S.
Buchenau U.
Courtens E.
Foret Marie
Rufflé B.
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