STROPHOIDAL ARGAND DIAGRAM AND THE DISTRIBUTION OF RELAXATION-TIMES IN K1-XLIXTAO3

被引：20

作者：

DOUSSINEAU, P ^{[1
]}

FARSSI, Y ^{[1
]}

FRENOIS, C ^{[1
]}

LEVELUT, A ^{[1
]}

MCENANEY, K ^{[1
]}

TOULOUSE, J ^{[1
]}

ZIOLKIEWICZ, S ^{[1
]}

机构：

[1] LEHIGH UNIV,DEPT PHYS,BETHLEHEM,PA 18015

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.70.96

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the relaxation of off-center Li+ ions in KTaO3 by dielectric measurements on 1% and 1.5% crystals, from 20 Hz to 2 MHz and from 4 to 200 K. The shape of the epsilon'' vs epsilon' Argand diagrams demonstrates the existence of a distribution of relaxation times. In analogy with spin glasses, a new expression is proposed for the analysis of these diagrams, a strophoidal function, which leads to a distribution function D(theta) decreasing for large theta as theta-(1+alpha) with 0 < alpha < 1. The most probable relaxation time theta(mp) of the distribution follows an Arrhenius law with a barrier height close to 950 K.

引用

页码：96 / 99

页数：4

共 27 条

[1]

[Anonymous], 1967, RANDOM MATRICES

[2] CONDENSATION OF RANDOM-SITE ELECTRIC DIPOLES - LI IN KTAO3 [J].