Interaction of quasilocal harmonic modes and boson peak in glasses

被引：45
作者：
Parshin, DA
Laermans, C
机构：
[1] Katholieke Univ Leuven, Dept Phys, B-3001 Louvain, Belgium
[2] St Petersburg State Tech Univ, St Petersburg 195251, Russia
来源：
PHYSICAL REVIEW B | 2001年 / 63卷 / 13期
关键词：
D O I：
10.1103/PhysRevB.63.132203
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The direct, proportionality relation between the boson peak maximum in glasses omega (b) and the Ioffe-Regel crossover frequency for phonons omega (d) is established. For several investigated materials omega (b) = (1.5 +/- 0.1)omega (d). At frequency omega (d) the mean free path of the phonons l becomes equal to their wavelength because of strong resonant scattering on quasilocal harmonic oscillators. We prove that the established correlation between omega (b) and omega (d) holds in the general case and is a direct consequence of bilinear coupling of quasilocal oscillators with the strain field.
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页数：4
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