Magnetoresistance and magnetization of La_(2/3)(Ca_(0.60)Ba_(0.40))_(1/3)MnO_3 in different temperature ranges  

作　　者：盖荣权 黄志高 赖恒 陈水源 都有为 

机构地区：[1]Department of Physics, Fujian Normal University, Fuzhou 350007, China [2]National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

出　　处：《中国有色金属学会会刊：英文版》2005年第2期323-327,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(G1999064508) supported by the National Key Project for Basic Research of China; Project(E0320002) supportedby NSF of Fujian Province of China

摘　　要：A polycrystalline La2/3(Ca0.60Ba0.40)1/3MnO3 was prepared by standard solid reaction method. Magnetization（M） and magnetoresistance of the sample were measured between T=77 K and 350 K. It is found that some correlations exist in the external field dependency of the magnetoresistance magnetoresistance and M in the low and high temperature regions. Moreover, there are different magnetic field dependence of magnetoresistance and magnetization in different temperature ranges, which indicates the presence of different magnetoresistance mechanisms. Based on the models of spin-polarized tunneling and percolation model, the simulated magnetoresistance obtained using Monte Carlo method well explains the experimental fact.A polycrystalline La-2/3 (Ca0.60Ba0.40)(1/3) MnO3 was prepared by standard solid reaction method. Magnetization(M) and magnetoresistance of the sample were measured between T= 77 K and 350 K. It is found that some correlations exist in the external field dependency of the magneto resistance magneto resistance and M in the low and high temperature regions. Moreover, there are different magnetic field dependence of magneto resistance and magnetization in different temperature ranges, which indicates the presence of different magnetoresistance mechanisms. Based on the models of spin-polarized tunneling and percolation model, the simulated magneto resistance obtained using Monte Carlo method well explains the experimental fact.

关 键 词：磁致电阻 锰钙钛矿 蒙特卡罗方法 磁化工艺 

分 类 号：O482.5[理学—固体物理]