Ti掺杂对La_(0.67)Ba_(0.33)MnO_3磁性和磁电阻影响  

Effect of Ti addition on magnetic properties and magnetores, istance for La_(0.67)Ba_(0.33)MNO_3 powder

作　　者：原晓波[1] 刘宜华[1] 黄宝歆[1] 王成建[1] 张汝贞[1] 梅良模[1] 

机构地区：[1]山东大学物理与微电子学院和晶体材料国家重点实验室,济南250100

出　　处：《功能材料与器件学报》2004年第2期195-199,共5页Journal of Functional Materials and Devices

基　　金：国家重点基础研究专项经费资助项目(G19980613010)

摘　　要：系统地研究了Ti掺杂对La_(0.67)Ba_(0.33)MnO_3颗粒材料磁性、电性和磁电阻效应的影响,随着Ti含量的增加,材料的磁化强度和居里温度快速下降,电阻率急剧增大,电阻率的峰值逐渐向低温移动。Ti的掺杂对材料低温下低场磁电阻影响不大,主要是显著提高了材料的本征磁电阻。1％的Ti掺杂使材料的室温磁电阻得到显著增强,1T磁场下,室温磁电阻达到-8.4％,比未掺杂的La_(0.67)Ba_(0.33)MnO_3材料增强了50％。The effects of Ti addition in La_(0.67)Ba_(0.33)MnO_3 powder on the magnetic and electric properties and magnetoresistance (MR) were studied systematically. With increasing Ti content, the magnetization and Curie temperature of the materials decrease fast, the resistivity increases rapidly, the resistivity peak shifts to the low temperature gradually. At low temperature, the Ti addition does not influence the low field MR a lot, but the intrinsic MR of the materials increases obviously. 1% Ti addition causes the MR at room temperature to enhance significantly. The MR ratio in 1 T magnetic field at room temperature reaches - 8.4%, which increases by 50% compared with the undoped La_(0.67)Ba_(0.33)MnO_3 material.

关 键 词：La0.67Ba0.33MnO3 Ti掺杂 磁电阻 电阻率 磁化强度 

分 类 号：O482[理学—固体物理] TB34[理学—物理]