Large Low-Field Magnetoresistance Observed in Polycrystalline La_(0.7)Ca_(0.3)MnO_(3) Films

住志海; 连贵君; 高矩; 周雅琴; 康晋峰; 李美亚; 熊光成

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Large Low-Field Magnetoresistance Observed in Polycrystalline La_(0.7)Ca_(0.3)MnO_(3) Films

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Large low-field magnetoresistance(LFMR)of∆p/pH=40%is obtained at 163 K within±3000 Oe in a polycrystalline La_(0.7)Ca_(0.3)MnO_(3)(LCMO)films prepared by pulsed laser deposition.The ratio∆p/pH 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 on the LFMR.The results indicate that a suitable film process can be used to increase the LFMR of LCMO films.

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《中国物理快报：英文版》 |1999年第1期|P.59-61|共3页
作者
住志海; 连贵君; 高矩; 周雅琴; 康晋峰; 李美亚; 熊光成;
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Department of Physics Peking University Beijing 100871;

Department of Physics Peking University Beijing 100871;

Department of Physics University of Hong Kong Pokfulam Road Hong Kong;

Department of Physics Peking University Beijing 100871;

Department of Physics Peking University Beijing 100871;

Department of Physics Peking University Beijing 100871Department of Physics Shantou University Shantou 515063;

Department of Physics Peking University Beijing 100871;

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正文语种 chi
中图分类 TQ1;
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resistance; Large;

Large Low-Field Magnetoresistance Observed in Polycrystalline La_(0.7)Ca_(0.3)MnO_(3) Films

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