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2002•Acta Scientiarum Naturalium Universitatis SunyatseniRequires access

Magnetic Properties and Colossal Magnetoresistance of La0.7Sr0.3MnO3 Materials Doped with Fe

李宝河, 鲜于文旭, Zhang Jian, 马廷钧

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Abstract

La0.7Sr0.3FexMnl-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 La0.7Sr0.3Feo.08Mn0.9203 sample is capable of reaching18%(8 ×10^5A·m-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.

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What this paper is about

La0.7Sr0.3FexMnl-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 La0.7Sr0.3Feo.08Mn0.9203 sample is capable of reaching18%(8 ×10^5A·m-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.

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Available abstract

La0.7Sr0.3FexMnl-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 La0.7Sr0.3Feo.08Mn0.9203 sample is capable of reaching18%(8 ×10^5A·m-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 concepts: Magnetoresistance, Curie temperature, Colossal magnetoresistance, Materials science, Ferromagnetism, Electrical resistivity and conductivity, Condensed matter physics, Doping

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