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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
关键词
凝聚态物理
磁结构
耦合作用
自旋态转变
condensed matter physics
magnetic structure
coupling function
spin state transition
