The propagation and damping of the acoustic excitations in vitreous silica is measured at terahertz frequencies using inelastic x-ray scattering. The apparent sound velocity shows a marked dispersion with frequency while the sound attenuation undergoes a crossover from a fourth to a second power law frequency dependence. This finding solves a recent controversy concerning the location of this crossover in vitreous silica, clarifying that it occurs at the position of the glass-characteristic excess of vibrational modes known as boson peak, and thus establishing a direct connection between boson peak and acoustic dispersion curves.

Sound Attenuation at Terahertz Frequencies and the Boson Peak of Vitreous Silica / Baldi, Giacomo; Giordano, V. M.; Monaco, Giulio; Ruta, B.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 104:19(2010), pp. 195501.195501.1-195501.195501.4. [10.1103/PhysRevLett.104.195501]

Sound Attenuation at Terahertz Frequencies and the Boson Peak of Vitreous Silica

Baldi, Giacomo;Monaco, Giulio;
2010

Abstract

The propagation and damping of the acoustic excitations in vitreous silica is measured at terahertz frequencies using inelastic x-ray scattering. The apparent sound velocity shows a marked dispersion with frequency while the sound attenuation undergoes a crossover from a fourth to a second power law frequency dependence. This finding solves a recent controversy concerning the location of this crossover in vitreous silica, clarifying that it occurs at the position of the glass-characteristic excess of vibrational modes known as boson peak, and thus establishing a direct connection between boson peak and acoustic dispersion curves.
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Baldi, Giacomo; Giordano, V. M.; Monaco, Giulio; Ruta, B.
Sound Attenuation at Terahertz Frequencies and the Boson Peak of Vitreous Silica / Baldi, Giacomo; Giordano, V. M.; Monaco, Giulio; Ruta, B.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 104:19(2010), pp. 195501.195501.1-195501.195501.4. [10.1103/PhysRevLett.104.195501]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/173686
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