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| La2/3Ca1/3Mn1-xCuxO3(x=0.15)系统低温下的电阻极小值现象及其起因 | |
| 引用本文： | 李 广,汤 萍,孙 霞,姜 勇,陈 岳,王 胜,黄 真,袁松柳. La2/3Ca1/3Mn1-xCuxO3(x=0.15)系统低温下的电阻极小值现象及其起因[J]. 物理学报, 1999, 48(3): 505-510 |
| 作者姓名： | 李 广 汤 萍 孙 霞 姜 勇 陈 岳 王 胜 黄 真 袁松柳 |
| 作者单位： | 中国科学院等离子体物理研究所，合肥 230031 |
| 摘 要： | 实验研究了La2/3Ca1/3Mn1-xCuxO3(x=0和0.15)样品在温度远低于居里温度时的电阻随温度的变化行为.发现未加磁场时，Cu掺杂样品在低温下表现出电阻极小值行为.这一极小值现象在外加磁场后消失.基于Kondo理论，对实验观察进行了讨论，并作了定量的理论与实验的比较.关键词： |
| 关 键 词： | LCMCO系统 低温 超导体 电阻极小值 |
| 收稿时间： | 1998-06-10 |
LOW-TEMPERATURE RESISTANCE MINIMUM AND ITS ORIGIN IN La2/3Ca1/3Mn1-xCuxO3(x=0.15) SYSTEM |
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| LI GUANG,TANG PING,SUN XIA,JIANG YONG,CHEN YUE,WANG SHENG,HUANG ZHEN and YUAN SONG-LIU. LOW-TEMPERATURE RESISTANCE MINIMUM AND ITS ORIGIN IN La2/3Ca1/3Mn1-xCuxO3(x=0.15) SYSTEM[J]. Acta Physica Sinica, 1999, 48(3): 505-510 | |
| Authors: | LI GUANG TANG PING SUN XIA JIANG YONG CHEN YUE WANG SHENG HUANG ZHEN YUAN SONG-LIU |
| Abstract: | The temperature dependence of resistance in the La2/3Ca1/3Mn1-xCuxO3(x=0 and 0.15) system at temperatures much lower than Curie temperature has been experimentally studied. It is found that a resistance minimum obviously appears in the zero-field R-T curve of the Cu-doped sample. Such a resistance minimum disappears when a magnetic field is applied to the sample. Based on Kondo theory, a quantitative comparison between the theory and the experimental data has been presented. It is shown that the experimental observation can be well understood within the framework of Kondo theory. |
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