Fe3O4 Segregation and Transport Properties of La0.67Ca0.33MnO3  

作　　者：周千学 戴明星 王仁卉 冯新南 王杨 夏正才 

机构地区：[1]Department of Physics, Wuhan University, Wuhan 430072 [2]Department of Physics, Huazhong University of Science and Technology, Wuhan 430074

出　　处：《Chinese Physics Letters》2006年第8期2194-2197,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 59972024.

摘　　要：Effect of Fe3O4 segregation at grain boundaries on the electrical transport and magnetic properties of La0.67Ca0.33MnO3 is investigated. The experimental results show that the Fe3O4 segregation not only shifts the paramagnetic-ferromagnetic transition temperature of La0.6TCa0.33MnO3 to a lower temperature region but also induces a new transition in a lower temperature region. Meanwhile, the transition processes observed in both the resistivity and magnetization curves are obviously widened. Compared to pure La0.67Ca0.33MnO3, we assume that the Fe3O4 segregation level at the grain boundaries can modify the electrical transport and magnetic properties of La0.67Ca0.33MnO3.Effect of Fe3O4 segregation at grain boundaries on the electrical transport and magnetic properties of La0.67Ca0.33MnO3 is investigated. The experimental results show that the Fe3O4 segregation not only shifts the paramagnetic-ferromagnetic transition temperature of La0.6TCa0.33MnO3 to a lower temperature region but also induces a new transition in a lower temperature region. Meanwhile, the transition processes observed in both the resistivity and magnetization curves are obviously widened. Compared to pure La0.67Ca0.33MnO3, we assume that the Fe3O4 segregation level at the grain boundaries can modify the electrical transport and magnetic properties of La0.67Ca0.33MnO3.

关 键 词：MAGNETORESISTANCE COMPOSITES SYSTEMS OXIDES 

分 类 号：O482.52[理学—固体物理]