Electrical transport behavior of La0.67Ca0.33MnO3/Fe3O4 composites |
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Authors: | ZC Xia SL YuanW Feng LJ ZhangGH Zhang J TangL Cheng QH ZhengL Liu S LiuCQ Tang |
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Institution: | Department of Physics, Huazhong, University of Science and Technology, Wuhan 430074, People's Republic of China |
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Abstract: | The influence of Fe3O4 contents on the electrical transport properties (resistivity and ac susceptibility) of a series of composite samples of La0.67Ca0.33MnO3/Fe3O4 is studied. Results show that the Fe3O4 phase not only shifts the intrinsic insulator-metal (I-M) transition temperature TP1 to a lower temperature, but also causes a new I-M transition at a lower temperature TP2 (TP2<TP1). On the basis of an analysis by scanning electron microscopy and X-ray diffraction, we suggest that the decrease of the I-M transition temperature and the formation of the new I-M transition are caused by the segregation of a new phases related to the Fe3O4 at grain boundaries or surfaces of the La0.67Ca0.33MnO3 grains. |
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Keywords: | 71 30 +h 75 30 Kz 75 30 Vn |
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