| 高阻相对La2／3Ca1／3MnO3低场磁电阻效应的影响 |
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| 引用本文： | 涂峰,夏正才,张国庆,彭刚,李衷怡,刘洁,刘菊,熊曹水,熊永红,袁松柳.高阻相对La2／3Ca1／3MnO3低场磁电阻效应的影响[J].稀有金属材料与工程,2004,33(2):193-195. |
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| 作者姓名： | 涂峰 夏正才 张国庆 彭刚 李衷怡 刘洁 刘菊 熊曹水 熊永红 袁松柳 |
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| 作者单位： | 华中科技大学,湖北,武汉,430074 |
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| 基金项目： | 国家自然科学基金项目(10174022);教育部"跨世纪优秀人才基金"资助项目:中国博士后基金项目 |
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| 摘 要： | 实验研究了La2／3Ca1/3MnO3系统晶界上掺杂(YSZ)对其输运性能和磁电阻效应(MR)的影响。样品是由溶胶．凝胶法制成的。通过对样品的电输运特性的测量表明,在掺杂量(x)低于2％时,掺杂引起电阻的增大并降低了金属．绝缘体转变温度;当掺杂量高于2％时电阻逐渐减小,且转变温度增加。而低场磁电阻效应随掺杂量增加,在x=1％时达到最大。
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| 关 键 词： | 钙钛矿结构 晶界 低场磁电阻效应 |
| 文章编号： | 1002-185X(2004)02-0193-03 |
| 修稿时间： | 2001年11月16 |
Effect of High Resistivity Phase on Low-Field Magnetoresistance of La2/3Ca1/3MnO3 |
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| Tu Feng,Xia Zhengcai,Zhang Guoqing,Peng Gang,Li Zhongyi,Liu Jie,Liu Li,Xiong Caoshui,Xiong Yonghong,Yuan Songliu.Effect of High Resistivity Phase on Low-Field Magnetoresistance of La2/3Ca1/3MnO3[J].Rare Metal Materials and Engineering,2004,33(2):193-195. |
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| Authors: | Tu Feng Xia Zhengcai Zhang Guoqing Peng Gang Li Zhongyi Liu Jie Liu Li Xiong Caoshui Xiong Yonghong Yuan Songliu |
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| Abstract: | The effect of YSZ doping level on transport properties and magnetoresistance in La2/3Ca1/3MnO3 has been experimentally studied. The samples are prepared by a standard sol-gel method. Through the measurement of the electronic properties of samples we can draw a conclusion that for x < 2%, the dopant cause the metal-insulator transition shift to low temperature and increase the resistance of samples. Then with the increase of doping level further, the resistance decreases and the metal-insulator transition temperature increase. Meanwhile , the YSZ dopant can increase the LFMR, it's maximum at 1%. |
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| Keywords: | perovskite grain boundary low field magnetoresistance |
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