Field dependence of magnetoresistance in epitaxial single-crystal La2/3Ca1/3MnO3-δ thin film

被引:0
作者
Kebin Li
Rongsheng Cheng
Shouguo Wang
Zhixiang Chen
Jun Fang
Zhihe Wang
Xiaowen Cao
Xiaojun Xu
Jingsheng Zhu
Yuheng Zhang
机构
[1] Chinese Academy of Sciences,Institute of Solid State Physics
[2] Chinese Academy of Sciences,High Magnetic Field Laboratory, Institute of Plasma Physics
[3] University of Science and Technology of China,Structural Research Laboratory
来源
Science in China Series A: Mathematics | 1999年 / 42卷
关键词
epitaxial La; Ca; MnO; thin films; colossal magnetoresistive effect; field dependence of magnetoresistance;
D O I
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摘要
Epitaxial La2/3Ca1/3MnO3 thin films were prepared on NdGaO3(1lO) substrates by d.c. magnetron sputtering method. The measurements of magnetoresistance ρ(H) upon magnetic field at different temperatures were carried out in the field range of 0–8 T. It is found that ρ(H) obeys the following relations: when the temperature (T) is higher than the Curie temperature\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$T_C , \rho (H) = \frac{1}{{\alpha (T) + \beta (T)H^2 }}$$ \end{document} below\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$T_C , \rho (H) = \rho _0 (T) + \frac{1}{{A(T) + B(T)exp(H/C(T))}}$$ \end{document} and\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$\rho (H) = \frac{1}{{\sigma (T) + \gamma (T)H}}$$ \end{document} whenT is far WowTc. It is suS8ested that the negative magnetoresistive effect is mainly due to enhancement of the magnetoconductance.
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页码:99 / 105
页数:6
相关论文
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