Influence of Gd Doping on Magnetic Behavior in La0.67Sr0.33CoO3, La0.67Sr0.33MnO3

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。

Abstract:

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 x>0.10 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.