| 用化学镀法制备的铜包覆La0.7Ca0.3MnO3复合体系的巨磁电阻效应 |
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| 引用本文： | 宋书建,张炯,熊永红,皮厚礼,任忠明,包西昌,熊曹水.用化学镀法制备的铜包覆La0.7Ca0.3MnO3复合体系的巨磁电阻效应[J].低温物理学报,2006,28(4):316-320. |
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| 作者姓名： | 宋书建 张炯 熊永红 皮厚礼 任忠明 包西昌 熊曹水 |
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| 作者单位： | 华中科技大学物理系,武汉,430074;华中科技大学物理系,武汉,430074;华中科技大学物理系,武汉,430074;华中科技大学物理系,武汉,430074;华中科技大学物理系,武汉,430074;华中科技大学物理系,武汉,430074;华中科技大学物理系,武汉,430074 |
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| 摘 要： | 用化学镀法制备了铜包覆的La_(0.7)Ca_(0.3)MnO_3(LCMO)颗粒.这些粉末压片之后在氩气中煅烧,形成铁磁-金属型结构,得到被铜均匀包覆的LCMO复合材料.利用扫描电子显微镜(SEM)观察了LCMO被铜包覆的形貌.研究了不同烧结温度下样品的电输运性质和在0.3T外加磁场下的磁电阻行为.结果表明LCMO在通过包覆铜进行表面修饰后,样品的绝缘体-金属的转变温度(Tp)往高温移动接近室温,室温附近的磁电阻值也得到显著提高.
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| 关 键 词： | 复合材料 磁电阻(MR) 边界效应 |
| 收稿时间： | 03 8 2006 12:00AM |
| 修稿时间： | 2006年3月8日 |
GIANT MAGNETORESISTANCE IN La0.7Ca0.3MnO3 COATED BY COPPER USING ELECTROLESS METHOD |
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| Song SHu-Jian ,Xiong Yong-Hong, Pi Hou-Li, Bao Xi-CHang, Xiong Cao-SHui.GIANT MAGNETORESISTANCE IN La0.7Ca0.3MnO3 COATED BY COPPER USING ELECTROLESS METHOD[J].Chinese Journal of Low Temperature Physics,2006,28(4):316-320. |
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| Authors: | Song SHu-Jian Xiong Yong-Hong Pi Hou-Li Bao Xi-CHang Xiong Cao-SHui |
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| Institution: | Department of Physics Huazhong University of Science and Technology, Wuhan 430074 |
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| Abstract: | The La_(0.7)Ca_(0.3)MnO_3(LCMO) powders coated by copper have been successfully prepared by an electroless method. After these powders were palletized and sintered at different temperature in argon, a ferromagnet-metal type composite, LCMO-Cu, have been fabricated. Temperature dependence resistivity and magnetoresistance in the applied field of 0.30 T were studied. It is absorbing that the metal-insulator transition temperature (T_p) approximately go up to 280 K after surface finish. |
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| Keywords: | composites magnetoresistance (MR) boundary effect |
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