La-Gd-Ca-Mn-O的磁性、电性和磁电阻效应  

Magnetic and Electric Properties and Magnetoresistive effects of La-Gd-Ca-Mn-O

作　　者：刘宜华[1] 岳龙强[1] 徐丽[2] 黄佶[2] 季刚[1] 王成建[1] 张汝贞[1] 胡季帆[1] 梅良膜[1] 

机构地区：[1]山东大学物理系,济南250100 [2]山东大学实验中心,济南250100

出　　处：《材料科学与工程》2001年第1期17-20,5,共5页Materials Science and Engineering

基　　金：国家重点基础研究专项经费! (G19980 6 13);国家自然科学基金!资助项目 (5 9772 0 40 )

摘　　要：在La0 67Ca0 33 MnO3 中进行了掺Gd研究 ,结果发现 ,经 140 0℃烧结的样品 ,获得了最佳的磁电阻效应。随掺Gd量增加 ,材料的相变温度逐渐下降 ,对应的峰值电阻率大幅度增加 ,居里温度逐渐下降 ,磁电阻比明显提高。掺入 11%的Gd后 ,可以使磁电阻比提高一个数量级。这些变化可以用晶格效应来解释。The doping effects of Gd in La 0 67 Ca 0 33 MnO 3 were studied. It was found that the optimum magnetoresistive effect was obtained by the sample sintered at 1400℃. With increasing the doping amount of Gd, the transition temperature of the samples decreased monotonically, the corresponding peak resistivity increased dramatically, the Curie temperature decreased monotonically, the magnetoresistance ratio increased significantly. The substitution of 0 11% Gd for La improved the magnetoresistance ratio by an order of magnitude. These changes can be explained by the lattice effects.

关 键 词：钙钛矿结构 稀土掺杂 锰氧化物 超大磁电阻 磁性 电性 磁电阻效应 

分 类 号：O482.4[理学—固体物理] O482.5[理学—物理]