La_(2/3)(Ca_(60)Ba_(40))_(1/3)MnO_3的磁电阻与磁化强度及其相关性  

Magnetoresistance, Magnetization and Their Correlation for La_(2/3)(Ca_(60)Ba_(40))_(1/3)MnO_3

作　　者：赖恒[1] 陈水源[1] 盖荣权[1] 黄志高[1] 

机构地区：[1]福建师范大学物理与光电信息科技学院,福建福州350007

出　　处：《稀土》2004年第4期22-25,共4页Chinese Rare Earths

基　　金：教育部高等学校骨干教师资助计划;福建省自然科学基金和创新人才基金(E0010022;2000E146;E0320002andK3-070);国家973项目(1999064508)

摘　　要：用固相反应法制备了La2/3(Ca60Ba40)1/3MnO3多晶材料,测量了77K～320K范围内的磁化曲线及在77K～350K范围内0～1.0T外磁场下的电阻率。结果表明低场磁电阻与高场磁电阻随外磁场的变化与磁化强度(M2)的变化存在着一定相关性,采用ρ(M)∝1-M2及低温隧穿磁电阻效应和逾渗模型解释了实验结果。A polycrystal sample La_(2/3)(Ca_(60)Ba_(40))_(1/3)MnO_3 was prepared by standard solid reaction method. Magnetization and magnetoresistance of the sample was measured between T=77K and 350K. The experimental results indicate that some correlations exist in the external field dependency of the magnetoresistance MR and M in the low and high magnetic field regions, which is explained by the tunneling magnetoresistance model and percolation model well.

关 键 词：磁电阻 磁化强度 稀土锰氧化物 

分 类 号：O482.5[理学—固体物理]