Dy掺入对La_(0.7)Sr_(0.3)CoO_3体系磁性的影响  

Effect of Dy Doping on Magnetism of La_(0.7)Sr_(0.3)CoO_3 System

作　　者：刘宁[1,2] 严国清[2,3] 郭焕银[2] 毛强[2] 蔡之让[2] 

机构地区：[1]安徽科技学院,安徽凤阳233100 [2]宿州学院,安徽宿州234000 [3]南京大学,南京210093

出　　处：《稀有金属材料与工程》2010年第5期874-877,共4页Rare Metal Materials and Engineering

基　　金：国家重大基础研究课题(2007CB925001);国家自然科学重点基础研究项目(001CB610604);安徽省教育厅自然科学研究项目(2006KJ266B);安徽省教育厅自然科学研究重大项目(ZD2007003-1;KJ2010A074)资助

摘　　要：通过M-T、M-H曲线的测量,研究Dy掺入对La0.7Sr0.3CoO3体系磁性的影响。结果表明,随着Dy含量的增加,样品Tc降低、M值减弱、矫顽力增强,并出现低温下M随着T的降低继续增大的反常现象。研究表明,体系磁性的变化来源于Dy掺入引起晶格参数的改变和磁环境的改变,以及Dy离子诱导的Co离子自旋态的转变。The effect of Dy doping on magnetism of La0.7Sr0.3CoO3 system was studied through the measurements of M-T curves and M-H curves.The results show that with Dy content increasing,Tc is decreased,M weakened,the coercive force strengthened,and the samples exhibit the abnormal phenomenon that M increases continuously with T decreasing in low temperature range.The research indicates that the variation of magnetism in the system comes from the changes of lattice parameters and magnetic environment caused by Dy doping,and from the spin state transition of Co ions induced by Dy ions.

关 键 词：La0.7Sr0.3CoO3体系 团簇玻璃态 自旋态转变 

分 类 号：O482.5[理学—固体物理]