Giant magnetoresistance effect and temperature dependence of magnetoresistance in La2/3Ca1/3MnO2 thin film

被引：0

作者：

李可斌

刘玲

孙建三

许小军

方军

王胜

王福堂

曹效文

朱警生

张裕恒

机构：

[1] Institute of Solid State Physics

[2] University of Science and Technology of China

[3] Structure Research Laboratory

[4] China Also in Structure Research Laboratory

[5] Chinese Academy of Sciences

[6] Hefei 230031

[7] High Field Laboratory

[8] Institute of Plasma Physics

[9] Hefei 230026

[10] China

来源：

Science China Mathematics | 1996年 / 06期

基金：

中国国家自然科学基金;

关键词：

La2/3Ca1/3MnO2 thin film; magnetoresistance; negative giant magnetoresistance;

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：

Magnetoresistanoe in the temperature region from 300 K to liquid helium temperature has been measured on good （100） oriented La2/3Ca1/3MnO2 thin films prepared by d.c. magnetron sputtering on ZrO2 （100） substrates. It is found that there appears a resistance peak at about TP = 72K at zero magnetic field, and this peak moves to higher temperature with increasing field H, and R decreases simultaneously. However, the magnetoresistance ratio MR = 5R /R （H） = （RoRH） /RH has a different temperature dependence. There are also MR peaks, but the temperature of maximum MR is at about 25 K which does not change with changing external magnetic field. The heat treatment （annealed at 700C in 105’Pa O2 for 30min） will make R reduce dramatically and has an effect on the temperature dependence of R and its MR.

引用

页码：624 / 630

页数：7