| (1-x)La2/3Ca 1/3 MnO 3/xSb2O 5复合体系的电子输运和磁电阻行为 |
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| 引用本文： | 袁力,缪菊红,王永强,刘莉,袁松柳.(1-x)La2/3Ca 1/3 MnO 3/xSb2O 5复合体系的电子输运和磁电阻行为[J].无机材料学报,2007,22(2):319-322. |
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| 作者姓名： | 袁力 缪菊红 王永强 刘莉 袁松柳 |
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| 作者单位： | 华中科技大学物理系,武汉,430074 |
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| 摘 要： | 用两步法制备了（1-x）La2／3Ca1／3MnO3／xSb2O5复合样品．零场下电阻温度关系测量表明，对x〈3％范围。随Sb2O5含量增加，复合样品电阻率增大，绝缘体一金属转变温度降低；而对x〉3％范围，随Sb2O5含量增加。复合样品电阻率减小，绝缘体一金属转变温度提高．磁电阻测量表明，少量Sb2O5同La,2／3C＆1／3MnO3复合，可明显增强磁电阻效应．
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| 关 键 词： | 锰基钙钛矿氧化物 复合 磁电阻 自旋极化隧道 |
| 文章编号： | 1000-324X（2007）02-0319-04 |
| 收稿时间： | 2006-3-27 |
| 修稿时间： | 2006-03-272006-05-16 |
Electrical Transport Behavior and Magnetoresistance Properties of (1-x)La2/3Ca 1/3 MnO 3/xSb2O 5 Composites |
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| YUAN Li,MIAO Ju-Hong,WANG Yong-Qiang,LIU Li,YUAN Song-Liu.Electrical Transport Behavior and Magnetoresistance Properties of (1-x)La2/3Ca 1/3 MnO 3/xSb2O 5 Composites[J].Journal of Inorganic Materials,2007,22(2):319-322. |
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| Authors: | YUAN Li MIAO Ju-Hong WANG Yong-Qiang LIU Li YUAN Song-Liu |
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| Affiliation: | DepartmentofPhysics,HuazhongUniversityofScience&Technology,Wuhan430074,China |
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| Abstract: | The composites with the nominal composition of (1 - x)La2/3Ca1/3MnO3/xSb2O5 were fabricated. The study of temperature dependence of resistivity at zero field shows that the metal-insulator transition temperature (Tp) and the resistivity of the composites are dependent on Sb2O5 addition level x. When x <3%, Tp shifts towards low temperature and resistivity increases with the increase of x. But Tp shifts towards high temperature and resistivity decreases with further increasing of x. The measurement for temperature dependence of magnetoresistance (MR) indicates that MR effect can be largely enhanced in the composites with small Sb2O5 addition. |
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| Keywords: | perovskite manganites composite magnetoresistance spin-polarized tunneling |
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