Gd掺杂对La_(0.67)Sr_(0.33)CoO_3、La_(0.67)Sr_(0.33)MnO_3体系磁行为的影响(英文)  

Influence of Gd Doping on Magnetic Behavior in La_(0.67)Sr_(0.33)CoO_3,La_(0.67)Sr_(0.33)MnO_3

作　　者：刘宁[1,2] 严国清[2,3] 朱光[2] 郭焕银[2] 

机构地区：[1]安徽科技学院,安徽凤阳233100 [2]宿州学院安徽省高校自旋电子与纳米材料重点实验室培育基地,安徽宿州234000 [3]南京大学固体微结构物理国家重点实验室,江苏南京210093

出　　处：《稀有金属材料与工程》2012年第1期19-23,共5页Rare Metal Materials and Engineering

基　　金：Key Programme of Grand Basic Research Programme of China (2007CB925001);National Key Basic Research Programme of China (001CB610604);Grand Natural Science Research Programme of Anhui Education Department (ZD2007003-1, KJ2010A074)

摘　　要：研究了La0.67-xGdxSr0.33CoO3、La0.67-xGdxSr0.33MnO3 (x=0.00, 0.05, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.67)体系的M-T曲线、M-H曲线。结果表明:随Gd掺杂浓度增高,La0.67-xGdxSr0.33CoO3体系的磁结构表现为团簇玻璃态,x>0.10样品的M-T曲线出现了低温区M值急剧上升的奇特现象;La0.67-xGdxSr0.33MnO3体系的磁结构从长程铁磁有序向团簇玻璃态、反铁磁状态转变,x≥0.50样品的M-T曲线在低温区急剧下降。两种体系呈现的不同现象,来源于Gd与Co、Mn不同的耦合作用和Co的自旋态的转变。M-T curves,and M-H curves of La0.67-xGdxSr0.33CoO3,La0.67-xGdxSr0.33MnO3（x=0.00,0.05,0.10,0.20,0.30,0.40,0.50,0.60,0.67） systems were measured.The results show that with increasing of doping Gd,magnetic structure of the La0.67-xGdxSr0.33CoO3 system exhibits cluster glass state,and the M-T curves of samples with x0.10 exhibit a peculiar phenomenon that M value rises sharply in a low temperature range;magnetic structure of La0.67-xGdxSr0.33MnO3 system changes from long-rang ferromagnetic order to cluster glass state,anti-ferromagnetic state,and the M-T curves of samples with x≥0.50 decline sharply in a low temperature range.The different phenomena shown by the two systems come from different coupling function between Gd and Co,Mn and from spin state transition of Co.

关 键 词：凝聚态物理 磁结构 耦合作用 自旋态转变 

分 类 号：TG132.27[一般工业技术—材料科学与工程]