Large low-field magnetoresistance observed in polycrystalline La0.7Ca0.3MnO3 films

被引：3
|
作者：
Wang, ZH [1 ]
Lian, GJ
Gao, J
Zhou, YQ
Kang, JF
Li, MY
Xiong, GC
机构：
[1] Peking Univ, Dept Phys, Beijing 100871, Peoples R China
[2] Univ Hong Kong, Dept Phys, Hong Kong, Peoples R China
[3] Shantou Univ, Dept Phys, Shantou 515063, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 1999年 / 16卷 / 01期
关键词：
D O I：
10.1088/0256-307X/16/1/021
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Large low-field magnetoresistance (LFMR) of Delta rho/rho(H) = 40% is obtained at 163 K within +/-3000 Oe in a polycrystalline La0.7Ca0.3MnO3 (LCMO) films prepared by pulsed laser deposition. The ratio Delta rho/rho(H) increases almost linearly with H in the measuring magnetic field range and the peak of LFMR ratios is observed near the resistivity peak temperature, which is different from the observation of spin-polarized intergrain tunnels. This experiment suggests that grain boundaries have large influences an the LFMR. The results indicate that a suitable film process can be used to increase the LFMR of LCMO films.
引用
收藏
页码：59 / 61
页数：3
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