CLUSTER AND DOMAIN-STATE DYNAMICS OF FERROELECTRIC SR1-XCAXTIO3 (X=0.007)

被引：171

作者：

BIANCHI, U

DEC, J

KLEEMANN, W

BEDNORZ, JG

机构：

[1] SILESIAN UNIV,INST PHYS,PL-40007 KATOWICE,POLAND

[2] IBM CORP,FORSCHUNGSLAB,CH-8803 RUSCHLIKON,SWITZERLAND

来源：

PHYSICAL REVIEW B | 1995年 / 51卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.51.8737

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A high, rounded peak of the permittivity, max′6×104, at T18 K evidence a percolative-type phase transition into a random-field-induced ferroelectric domain state of the doped system Sr1-xCaxTiO3 (x=0.007). Dispersion measurements of the permittivity reveal strong polydispersivity of the system. Deviations from Arrhenius behavior below T=11 K indicate the onset of dissipative quantum tunneling of the Ca2+ dipoles between their different off-center positions. Anomalies in both the linear and the nonlinear dielectric permittivity are explained by the presence of two different dissipative cluster contributions. They are attributed to the reorientation of Ca2+-centered polar nanometer-scale regions within ferroelastic single domains of the system and to their interaction with coherent acoustic quantum fluctuations of the host lattice, respectively. © 1995 The American Physical Society.

引用

页码：8737 / 8746

页数：10

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