| La0.3Ca0.7Mn1－xVxO3体系的有序相和再入型自旋玻璃行为研究 |
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| 引用本文： | 刘宁,严国清,毛强,王桂英,郭焕银.La0.3Ca0.7Mn1－xVxO3体系的有序相和再入型自旋玻璃行为研究[J].物理学报,2010,59(8):5759-5765. |
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| 作者姓名： | 刘宁 严国清 毛强 王桂英 郭焕银 |
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| 作者单位： | (1)安徽科技学院理学院,凤阳 233100; 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,宿州 234000; (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,宿州 234000 |
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| 基金项目： | 国家自然科学基金重点项目(批准号: 19934003),国家重点基础研究发展计划 (批准号: 001CB610604, 2007CB925001),安徽省教育厅自然科学研究重点项目(批准号:KJ2010A074)资助的课题. |
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| 摘 要： | 通过对La0.3Ca0.7Mn1－xVxO3(x=0.05,0.10,0.134,0.20)体系的M-T曲线、ρ-T曲线、ESR谱的测量,研究了Mn位掺V对La0.3Ca0.7MnO3体系电荷序和自旋序的影响.结果表明,当0.05≤x≤0.134时, 体系存在电荷有序(CO)相,其自旋序随温度降低发生顺磁(PM)-电荷有序(CO)-反铁磁(AFM)变化.当x＝0.20时,CO相逐步融化,在40 K发生自旋玻璃转变,表现出再入型的自旋玻璃行为,低温下的基态存在着多种复杂的磁相互作用之间的竞争机理.
关键词：
电荷有序
自旋序
相分离
再入型自旋玻璃行为
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| 关 键 词： | 电荷有序 自旋序 相分离 再入型自旋玻璃行为 |
| 收稿时间： | 2009-11-11 |
Research on order phase and second-entering-type spin glass behavior of La0.3Ca0.7Mn1-xVxO3 system |
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| Liu Ning,Yan Guo-Qing,Mao Qiang,Wang Gui-Ying,Guo Huan-Yin.Research on order phase and second-entering-type spin glass behavior of La0.3Ca0.7Mn1-xVxO3 system[J].Acta Physica Sinica,2010,59(8):5759-5765. |
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| Authors: | Liu Ning Yan Guo-Qing Mao Qiang Wang Gui-Ying Guo Huan-Yin |
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| Institution: | College of sciences,Anhui Science and Technology University,Fengyang 233100,China; Anhui Key Laboratory of Spin Electron and Nanomaterials (Cultivating Base),Suzhou College,Suzhou 234000,China;Anhui Key Laboratory of Spin Electron and Nanomaterials (Cultivating Base),Suzhou College,Suzhou 234000,China;Anhui Key Laboratory of Spin Electron and Nanomaterials (Cultivating Base),Suzhou College,Suzhou 234000,China;Anhui Key Laboratory of Spin Electron and Nanomaterials (Cultivating Base),Suzhou College,Suzhou 234000,China;Anhui Key Laboratory of Spin Electron and Nanomaterials (Cultivating Base),Suzhou College,Suzhou 234000,China |
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| Abstract: | The influence of V doping at Mn site on charge order and spin order of La0.3Ca0.7MnO3 system has been studied by the measurement of magnetization-temperature (M-T) curves,resistivity-temperature (ρ-T) curves and electron spin resonance (ESR) spectra of samples La0.3Ca0.7Mn1－xVxO3 (x=0.05,0.10,0.134,0.20).The results show that, when 0.05≤3≤0.134,charge ordering (CO) phase exists in the system,and the spin order of the system exhibits the serial changes of paramagnetism (PM)—charge ordering (CO)—antiferromagnetism (AFM) with the decrease of temperature.When x=0.20,the charge ordering melts,and the system exhibits second-entering-type spin glass behavior. |
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| Keywords: | charge ordering spin order phase separation second-entering-type spin glass behavior |
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