La_(2/3)Sr_(1/3)MnO_3的室温磁电阻效应  

Investigation on Room-temperature Magnetoresistance of La_(2/3)Sr_(1/3)MnO_3

作　　者：张变芳[1] 王振彪[1] 杜伟胜[1] 刘力虎[2] 唐贵德[2] 

机构地区：[1]石家庄铁道学院数理系,河北石家庄050043 [2]河北师范大学物理学院,河北石家庄050016

出　　处：《河北师范大学学报（自然科学版）》2005年第6期563-565,共3页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金资助项目(10074013)

摘　　要：采用溶胶凝胶法制备了La2/3Sr1/3MnO3多晶样品.X射线衍射测试结果表明样品具有钙钛矿结构.利用振动样品磁强计测量了粉体样品在室温下的磁性能,样品表现为铁磁性.对不同烧结温度下形成的块体样品的导电性以及磁电阻的研究表明,随着烧结温度的提高材料的金属绝缘体转变温度有所增加,说明材料的烧结温度对其电导性有很大的影响.La2/3Sr1/3MnO3 polycrystalline powers were prepared by sol-gel method. The result of X-ray diffraction indicated that the powers exist with perovskite structure. The magnetic property of powders was characterized by using vibrating sample magnetometer. The sample shows ferromagnetism. The research of conductivity and magnetoresistance of bulk samples sintered at different temperatures revealed that with increasing sintered temperature the critical temperature at which the state of the sample transforms from metal to semiconductor increases, which indicates that the sintered temperature of this material affects its conductivity strongly.

关 键 词：溶胶-凝胶法 磁电阻 钙钛矿结构 

分 类 号：O482.54[一般工业技术—材料科学与工程]