Origin of boson peak in glasses: Role of Ioffe-Regel crossover and atomic soft modes

被引：3
|
作者：
Klinger, Michael I. [1 ]
机构：
[1] Bar Ilan Univ, Dept Phys, IL-52900 Tel Aviv, Israel
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2007年 / 353卷 / 18-21期
关键词：
glasses; nitride glasses; infrared glasses; chalcogenides; oxide glasses; alkali silicates; borates; thermal properties; thermal conductivity;
D O I：
10.1016/j.jnoncrysol.2007.01.050
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A theoretical 'complete soft-mode-dynamics' model of the origin and properties of the boson peak accompanied by a high-frequency sound, observed in glasses of a certain type, is described. The origin is determined by interaction of non-acoustic vibrations with acoustic phonons and a loffe-Regel crossover for their inelastic scattering. The non-acoustic excitations are associated with vibrations of atomic soft-mode 'defects'. Two types of boson peak can be predicted in agreement with experiments. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：1824 / 1827
页数：4
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