0.10樣品的M-T曲線出現(xiàn)了低溫區(qū)M值急劇上升的奇特現(xiàn)象；La0.67-xGdxSr0.33MnO3體系的磁結(jié)構(gòu)從長(zhǎng)程鐵磁有序向團(tuán)簇玻璃態(tài)、反鐵磁狀態(tài)轉(zhuǎn)變，x≥0.50樣品的M-T曲線在低溫區(qū)急劇下降。兩種體系呈現(xiàn)的不同現(xiàn)象，來(lái)源于Gd與Co、Mn不同的耦合作用和Co的自旋態(tài)的轉(zhuǎn)變。"/>

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

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    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)體系的M-T曲線、M-H曲線。結(jié)果表明：隨Gd摻雜濃度增高，La0.67-xGdxSr0.33CoO3體系的磁結(jié)構(gòu)表現(xiàn)為團(tuán)簇玻璃態(tài)，x>0.10樣品的M-T曲線出現(xiàn)了低溫區(qū)M值急劇上升的奇特現(xiàn)象；La0.67-xGdxSr0.33MnO3體系的磁結(jié)構(gòu)從長(zhǎng)程鐵磁有序向團(tuán)簇玻璃態(tài)、反鐵磁狀態(tài)轉(zhuǎn)變，x≥0.50樣品的M-T曲線在低溫區(qū)急劇下降。兩種體系呈現(xiàn)的不同現(xiàn)象，來(lái)源于Gd與Co、Mn不同的耦合作用和Co的自旋態(tài)的轉(zhuǎn)變。

    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.

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劉 寧,嚴(yán)國(guó)清,朱 光,郭煥銀. Influence of Gd Doping on Magnetic Behavior in La0.67Sr0.33CoO3, La0.67Sr0.33MnO3[J].稀有金屬材料與工程,2012,41(1):19~23.[Liu Ning, Yan Guoqing, Zhu Guang, Guo Huanyin. Influence of Gd Doping on Magnetic Behavior in La0.67Sr0.33CoO3, La0.67Sr0.33MnO3[J]. Rare Metal Materials and Engineering,2012,41(1):19~23.]
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  • 收稿日期:2011-01-12
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