Magnetic Properties and Colossal Magnetoresistance of La0.7Sr0.3MnO3 Materials Doped with Fe
来源期刊：JOURNAL OF RARE EARTHS2002年第2期
论文作者：马廷钧 张健 鲜于文旭 李宝河
Key words：rare earths; CMR effect; sol-gel technique; metal-insulator transition;
Abstract: La0.7Sr0.3FexMn1-xO3 compounds (0.05≤x≤0.18) were prepared by the sol-gel technique. The effects of Fe doping on the magnetic properties, conductivity and magnetoresistance for La0.7Sr0.3MnO3 was investigated. Experimental results indicate that the Fe doping leads to a decrease in the ferromagnetic ordering temperature, an increase in the resistance and magnetoresistance effect. For samples of x=0.05 and x=0.08 two peaks are observed in their ρ-T curve. Magnetic resistivity (MR) of La0.7Sr0.3Fe0.08Mn0.92O3 sample is capable of reaching 18%(8×105Am-1, 293 K). At x≥0.1, metal-insulator (M-I) transition temperature (Tp) is lower than ferromagnetic Curie temperature (TC) by about 50～80 K.
马廷钧1，张健2，鲜于文旭3，李宝河1
(1.Beijing Technology and Business University, Beijing 100037, China;
2.Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;
3.Department of Physics, Jilin University, Changchun 130023, China)
Abstract:La0.7Sr0.3FexMn1-xO3 compounds (0.05≤x≤0.18) were prepared by the sol-gel technique. The effects of Fe doping on the magnetic properties, conductivity and magnetoresistance for La0.7Sr0.3MnO3 was investigated. Experimental results indicate that the Fe doping leads to a decrease in the ferromagnetic ordering temperature, an increase in the resistance and magnetoresistance effect. For samples of x=0.05 and x=0.08 two peaks are observed in their ρ-T curve. Magnetic resistivity (MR) of La0.7Sr0.3Fe0.08Mn0.92O3 sample is capable of reaching 18%(8×105Am-1, 293 K). At x≥0.1, metal-insulator (M-I) transition temperature (Tp) is lower than ferromagnetic Curie temperature (TC) by about 50～80 K.
Key words:rare earths; CMR effect; sol-gel technique; metal-insulator transition;
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