Orientational and fluctuation polarizations of langevin dipoles in a random electric field

被引:14
作者
Prosandeev, SA [1 ]
机构
[1] Rostov State Univ, Rostov Na Donu 344007, Russia
基金
俄罗斯基础研究基金会;
关键词
Spectroscopy; State Physics; Random Field; External Field; Polar Region;
D O I
10.1134/1.1611250
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The polarization and dielectric susceptibility of polar regions composed of Langevin microdipoles in a random electric field are considered. It is shown that the polarization of this system has orientational and fluctuation components in addition to the conventional phonon contribution. Both components diverge when the amplitude of the random field tends to zero but can be stabilized in finite internal fields. The orientational susceptibility does not depend on the external field if its amplitude is smaller than the amplitude of the random field and rapidly decreases in the opposite case. The field dependence of the fluctuation susceptibility exhibits a maximum. With an increase in the field, the fluctuation susceptibility quadratically increases as const + AE(2) in weak fields and decreases as E-1/2 in strong fields. The equation of state takes the form P-2 similar to E in relatively strong fields (as compared to the internal field) and P similar to E in weak fields. (C) 2003 MAIK "Nauka / Interperiodica".
引用
收藏
页码:1774 / 1779
页数:6
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