La_(2/3)Sr_(1/3)Mn_(1-x)Cu_xO_3的磁电阻研究  

Investigation on magnetoresistance of La_(2/3)Sr_(1/3)Mn_(1-x)Cu_xO_3

作　　者：张变芳[1] 杜明辉[1] 刘力虎[2] 

机构地区：[1]石家庄铁道大学数理系,河北石家庄050043 [2]河北师范大学物理科学与工程信息学院,河北石家庄050016

出　　处：《功能材料》2011年第B02期189-192,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50625518);河北师范大学青年基金资助项目(L2005Q04);河北省教育厅资助项目(Z20103052009155)

摘　　要：采用溶胶-凝胶(sol-gel)法制备了La2/3Sr1/3Mn1-xCuxO3(x=0.00、0.05、0.10、0.20)的多晶样品。利用振动样品磁强计测量了样品在室温下的磁性能;利用X射线衍射确定了粉体的组成;利用扫描电子显微镜观察了颗粒的形貌。在1.8T磁场作用下,当x=0时,在370K,样品的磁电阻几乎成线性变化,峰值为-40%;由于Cu2+掺入,不仅对钙钛矿样品的磁性有抑制作用,也使其磁电阻效应减小。La2/3Sr1/3MnO3 polycrystalline powers were prepared by sol-gel method. The magnetic property of powders was characterized using vibrating sample magnetometer. The phase structure was presented by X-ray diffractometer. In addition, the morphology of the powders grain was observed by scan electron microscope; Under an applied magnetic filed of 1.8T, the maximum value of MR is -40.5 % for the sample with x = 0 at 370K. Since Cu2. incorporation, not only for the magnetic properties of perovskite inhibited, but also to reduce the magnetoresistance effect.

关 键 词：溶胶-凝胶法 多晶 钙钛矿 磁电阻 

分 类 号：TM27[一般工业技术—材料科学与工程]