Nonlinear interactions of longitudinal acoustic modes in magnets near the antiferromagnetic-ferromagnetic phase transition

被引：1
|
作者：
Mirsaev, IF
机构：
[1] Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
来源：
PHYSICS OF THE SOLID STATE | 1997年 / 39卷 / 08期
关键词：
Spectroscopy; Phase Transition; State Physics; Elastic Constant; Transition Point;
D O I：
10.1134/1.1130059
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The effective elastic anharmonicity induced by exchange magnetoelastic interaction is investigated for easy plane antiferromagnets, in which an antiferromagnetic-ferromagnetic phase transition takes place. Near the transition point this anharmonicity can be manifested in nonlinear interactions of longitudinal acoustic modes, resulting in magnetoacoustic mode-frequency conversion effects. It is shown that these effects are amplified in the vicinity of the phase transition, because the effective third-order elastic constants increase by several orders of magnitude. The generation of longitudinal acoustic second harmonics is analyzed as an example. (C) 1997 American Institute of Physics.
引用
收藏
页码：1271 / 1275
页数：5
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