ULTRALOW-FREQUENCY DISPERSION IN MACROSCOPIC SUSCEPTIBILITIES

被引：14

作者：

CHAVES, AS

LETELIER, FV

SAMPAIO, JF

GAZZINELLI, R

机构：

[1] Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, CEP 30161, Belo Horizonte, MG

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.47.4880

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A theory is presented which predicts a sample-geometry-dependent dispersion at very low frequencies in a general macroscopic susceptibility chi of a system, in a thermal bath, due to an adiabatic isothermal crossover. The dispersion occurs whenever the isothermal value chi(T) is larger than the adiabatic value chi(S). The effect is analogous to the thermal-diffusion central peak. The dispersion is critical in the dielectric permittivity (magnetic permeability) of a system undergoing a second-order ferroelectric (ferromagnetic) phase transition. Measurements on the dielectric permittivity of ferroelectric KH2PO4 and (NH2CH2COOH)3.H2SO4 demonstrate clearly the predicted dispersion, with features in agreement with the theory.

引用

页码：4880 / 4885

页数：6

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