A phenomenological description of temperature dependence of magnetoresistance in La 2/3Ca1/3MnO3-δ thin films

被引：0

作者：

李西军

李可斌

杜家驹

许小军

方军

王智河

曹效文

朱警生

张裕恒

机构：

来源：

Science China Mathematics | 1998年 / 03期

关键词：

La 2/3Ca 1/3MnO 3 epitaxial thin films; magnetoresistance; mean-field expression;

D O I：

暂无

中图分类号：

O484 [薄膜物理学];

学科分类号：

080501 ; 1406 ;

摘要：

The electrical resistance in zero magnetic field and magnetoresistance in different external magnetic fields have been measured in a temperature range of 77-300 K. It is found that the temperature dependence of magnetoresistance can be well described by a phenomenological formula of ρ(T)=(1σ(T)= (1α(M/M s) 2+βexp(-E 0/k BT), where the fitting parameters α,β vary as the external magnetic field H changes, E 0 is the activation energy, E 0/k B =1160 K, M s is the saturation magnetization, the temperature and magnetic field dependence of M/M s is obtained by the mean-field expression.

引用

页码：308 / 312

页数：5