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

被引：129

作者：

Baldi, G. ^{[1
,2
]}

Giordano, V. M. ^{[1
]}

Monaco, G. ^{[1
]}

Ruta, B. ^{[1
]}

机构：

[1] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[2] UOS Roma, CNR, IPCF, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 19期

关键词：

BRILLOUIN-SCATTERING; WAVELENGTH EXCITATIONS; THERMAL-CONDUCTIVITY; PROPAGATING MODES; GLASSES; RELAXATION; SOLIDS; WAVES; HEAT;

D O I：

10.1103/PhysRevLett.104.195501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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