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Communication: High-frequency acoustic excitations and boson peak in glasses: A study of their temperature dependence
1.See, for example, 10th International Workshop on Disordered Systems, edited by A. Fontana, P. Verrocchio, and G. Viliani, Philos. Mag. 87 (2007).
12.A. Monaco, A. I. Chumakov, G. Monaco, W. A. Crichton, A. Meyer, L. Comez, D. Fioretto, J. Korecki, and R. Rüffer, Phys. Rev. Lett. 97, 135501 (2006).
23.We recall that , with and , where is the mass density, is the molecular mass, and is the transverse (longitudinal) sound velocity. Here is taken from Ref. 21, and from unpublished Brillouin scattering data.
26.G. Ruocco, F. Sette, R. Di Leonardo, D. Fioretto, M. Krisch, M. Lorenzen, C. Masciovecchio, G. Monaco, F. Pignon, and T. Scopigno, Phys. Rev. Lett. 83, 5583 (1999).
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The results of a combined experimental study of the high-frequency acoustic dynamics and of the vibrational density of states (VDOS) as a function of temperature in a glass of sorbitol are reported here. The excess in the VDOS at over the Debye, elastic continuum prediction (boson peak) is found to be clearly related to anomalies observed in the acoustic dispersion curve in the mesoscopic wavenumber range of few . The quasiharmonic temperature dependence of the acoustic dispersion curves offers a natural explanation for the observed scaling of the boson peak with the elastic medium properties.
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