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 ∼4.5 meV 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 nm^{−1}. 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.

Communication: High-frequency acoustic excitations and boson peak in glasses: A study of their temperature dependence / Ruta, B.; Baldi, Giacomo; Giordano, V. M.; Orsingher, Laura; Rols, S.; Scarponi, F.; Monaco, Giulio. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 133:4(2010), pp. 041101.041101.1-041101.041101.4. [10.1063/1.3460815]

Communication: High-frequency acoustic excitations and boson peak in glasses: A study of their temperature dependence

Baldi, Giacomo;Orsingher, Laura;Monaco, Giulio
2010

Abstract

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 ∼4.5 meV 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 nm^{−1}. 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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Ruta, B.; Baldi, Giacomo; Giordano, V. M.; Orsingher, Laura; Rols, S.; Scarponi, F.; Monaco, Giulio
Communication: High-frequency acoustic excitations and boson peak in glasses: A study of their temperature dependence / Ruta, B.; Baldi, Giacomo; Giordano, V. M.; Orsingher, Laura; Rols, S.; Scarponi, F.; Monaco, Giulio. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 133:4(2010), pp. 041101.041101.1-041101.041101.4. [10.1063/1.3460815]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/173691
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