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| La-Gd-Ca-Mn-O的不可逆磁电阻效应 | |
| 引用本文： | 刘宜华,张汝贞,王成建,岳龙强,栾开政,梅良模,黄佶. La-Gd-Ca-Mn-O的不可逆磁电阻效应[J]. 材料研究学报, 2001, 15(5): 540-544 |
| 作者姓名： | 刘宜华 张汝贞 王成建 岳龙强 栾开政 梅良模 黄佶 |
| 作者单位： | 1. 山东大学物理系,济南市,250100 2. 山东大学物理系 3. 山东大学实验中心 |
| 基金项目： | 国家重点基础研究专项经费G19980613010，国家科技部经费资助项目 |
| 摘 要： | 随掺Gd量的增加，La-Gd-Ca-Mn-O化合物的金属-绝缘体相变温度逐渐下降，对应的峰值电阻率大幅度增加，磁电阻比明显提高，掺入11%的Gd可以使材料的磁电阻比提高一个数量级。Gd的掺入还引起材料磁电阻出现明显的不可逆效应。随掺Gd量增加，不可逆效应明显增大。 |
| 关 键 词： | 稀土锰氧化物 巨磁电阻效应 不可逆磁电阻效应 磁电阻 导电性 |
| 文章编号： | 1005-3093(2001)05-0540-05 |
| 修稿时间： | 2000-09-04 |
IRREVERSIBLE MAGNETORESISTANCE EFFECT IN La-Gd-Ca-Mn-O |
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| LIU Yihua,ZHANG Ruzhen,WANG Chengjian,YUE Longqiang,LUAN Kaizheng,MEI Liangmo. IRREVERSIBLE MAGNETORESISTANCE EFFECT IN La-Gd-Ca-Mn-O[J]. Chinese Journal of Materials Research, 2001, 15(5): 540-544 | |
| Authors: | LIU Yihua ZHANG Ruzhen WANG Chengjian YUE Longqiang LUAN Kaizheng MEI Liangmo |
| Abstract: | The doping effects of Gd in La-Ca-Mn-O compound were studied. It was found that the metal-insulator transition temperature decreased monotonously, the corresponding peak resistivity increased dramatically, the magnetoresistance ratio increased significantly with increasing the doping amount of Gd. The substitution of 11% Gd for La in La-Ca-Mn-O improved the magnetoresistance ratio by an order of magnitude. An irreversible effect of magnetoresistance was found in the Gd doped samples. This effect was enhanced with increasing Gd doping amount remarkably. It can be ascribed to a field-induced irreversible transition to metallic state. |
| Keywords: | rare-earth manganite CMR effect irreversible magnetoresistance effect |
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