Sb_2O_3的丰度对(1-x)La_(0.6)Dy_(0.1)Sr_(0.3)MnO_3/(x/2)(Sb_2O_3)电输运性质的影响  

EFFECT OF Sb_2O_3 ABUNDANCE ON THE ELECTRICAL TRANSPORT PPRPERTIES OF(1-x)La_(0.6)Dy_(0.1)Sr_(0.3)MnO_3/(x/2)(Sb_2O_3)

作　　者：杨杰[1,2] 唐永刚[1,2] 王桂英[1,2] 彭振生[1] 

机构地区：[1]自旋电子与纳米材料安徽省重点实验室(培育基地),安徽宿州234000 [2]宿州学院机械与电子工程学院,安徽宿州234000

出　　处：《低温物理学报》2012年第1期41-45,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金重点项目(批准号:19934003);安徽省教育厅自然科学研究重点项目(批准号:KJ2011A259);安徽省教育厅自然科学研究项目(批准号:KJ2010B229;KJ2010B228);自旋电子与纳米材料安徽省重点实验室培育基地开放课题(2011YKF05)资助项目~~

摘　　要：用固相反应法制备(1-x)La0.6Dy0.1Sr0.3MnO3/x/2(Sb2O3)(x=0.00,0.02,0.15)样品,通过X射线衍射(XRD)图谱,扫描电子显微镜(SEM)照片及SEM能谱(EDS),ρ～T曲线研究样品的结构及电输运性质.结果表明:Sb离子没有进入Mn位,Sb2O3包覆在La0.6Dy0.1Sr0.3MnO3颗粒表面,Sb2O3起助熔剂作用,使得复合样品的颗粒变大且大小相对均匀;复合样品的绝缘体-金属转变温度TP较纯的La0.6Dy0.1Sr0.3MnO3的TP提高20K左右,对x=0.15的样品电阻高峰值比纯的La0.6Dy0.1Sr0.3MnO3的峰值电阻率增大两个数量级,用自旋极化隧穿理论予以解释.Polycrystalline samples of （1-x）La0.6Dy0.1Sr0.3MnO3/x/2（Sb2O3） （x=0. 00, 0. 02, 0. 15） were prepared by the solid state reaction method, and their structure and electrical transport properties were studied through the analysis of X-ray diffraction （XRD） patterns, scanning electron microscopy （SEM） photographs, SEM spectroscopy （EDS）, and resistivity-temperature （puT） curves. The results indicate that： Sb ions do not enter the Mn site, Sb2O3 covers the grain surface Of La0.6Dy0.1Sr0.3MnO3, and it acts as a flux and makes the composite grains have larger and comparatively uniform size; the insulator-metal transition temperature Tv of composite samples is about 20K higher than that of pure La0.6Dy0.1Sr0.3MnO3, the resistivty peak value of the sample of x = 0. 15 is two orders of magnitude higher than that of pure La0. 6 Dy0.1 Sr0. 3 MnO3, and this can be explained by the spin polarized tunneling mechanism.

关 键 词：钙钛矿锰氧化物 二相复合体 电输运性质 

分 类 号：O513[理学—低温物理]