研究了Lao0.67-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 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.
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