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钙钛矿型稀土锰氧化物La0.7Sr0.3FexMn1—xO3的磁性和巨磁电阻效应
引用本文:李宝河,鲜于文旭,张健,马廷钧.钙钛矿型稀土锰氧化物La0.7Sr0.3FexMn1—xO3的磁性和巨磁电阻效应[J].中国稀土学报,2001,19(2):174-177.
作者姓名:李宝河  鲜于文旭  张健  马廷钧
作者单位:1. 北京工商大学数理部,
2. 吉林大学物理系,
3. 中国科学院物理所,
摘    要:采用溶胶-凝胶工艺制备了La

关 键 词:巨磁电阻效应  溶胶-凝胶工艺  磁性  金属-绝缘体转变  钙钛矿型稀土锰氧化物
文章编号:1000-4343(2001)02-0174-04
修稿时间:1999年12月12

Magnetic Properties and Colossal Magnetoresistance of La(Sr)MnO3 Materials Doped with Fe
LI Bao-he,XIANYU Wen-xu,ZHANG Jian,MA Ting-jun.Magnetic Properties and Colossal Magnetoresistance of La(Sr)MnO3 Materials Doped with Fe[J].Journal of the Chinese Rare Earth Society,2001,19(2):174-177.
Authors:LI Bao-he  XIANYU Wen-xu  ZHANG Jian  MA Ting-jun
Abstract:La0.7Sr0.3FexMn1-xO3 compounds (0.05≤x≤0.18) were prepared by the sol-gel technique. The effect 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. MR of La0.7Sr0.3Fe0.08Mn0.92O3 sample is 18% (8×105 A*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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