Boson peak and its relation to acoustic attenuation in glasses.
Experimental results on the density of states and on the acoustic modes of glasses in the THz region are compared to the predictions of two categories of models. A recent one, solely based on an elastic instability, does not account for most observations. Good agreement without adjustable parameters is obtained with models including the existence of nonacoustic vibrational modes at THz frequency, providing in many cases a comprehensive picture for a range of glass anomalies.
Rufflé
B
B
Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS Université Montpellier II, F-34095 Montpellier Cedex 5, France.
Parshin
D A
DA
Courtens
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E
Vacher
R
R