中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 15 No. 2 April 2005 |
La2/3(Ca0.60Ba0.40)1/3MnO3 in different temperature ranges
CHEN Shui-yuan(陳水源)1, DU You-wei(都有為)2
（1. Department of Physics, Fujian Normal University, Fuzhou 350007, China;
2. National Laboratory of Solid State Microstructures, Nanjing University,
Nanjing 210093, China）
Abstract: 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=77K and 350K. 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.
Key words: magnetoresistance; magnetization; manganese perovskite; Monte Carlo method
