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Giant Magnetoresistance in Granular Perovskite La0.8Sr0.2MnO3 |
ZHANG Ning1,2;DING Wei-ping1;GUO Zai-bin1;ZHONG Wei1;DU Kai-he2;DU You-wei1 |
1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
2Key Laboratory of Jiangsu Province for Optic and Electric Techniques, Nanjing Normal University, Nanjing 210024
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Cite this article: |
ZHANG Ning, DING Wei-ping, GUO Zai-bin et al 1997 Chin. Phys. Lett. 14 229-232 |
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Abstract The electric and magnetic properties in granular perovskite La0.8Sr0.2MnO3 have been investigated. A giant magnetoresistance (GMR) has been observed at temperatures well below TC, the Curie temperature, associated with crystal intrinsic magnetic properties. The granular GMR effect is also isotropic but shows some characteristics different from those in the films and crystals of similar perovskites. This suggests an effect of interfacial spin-dependent tunneling in the granular perovskite at temperatures much lower than TC. In addition, with the reduction of grain size, an evident superparamagnetic behavior has been observed.
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Keywords:
81.35.+k
73.40.-e
72.15.Gd
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Published: 01 March 1997
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