La_(2/3)Ca_(1/3)Mn_(1-x)Cu_xO_3(x=0.15)系统低温下的电阻极小值现象及其起因  

LOW TEMPERATURE RESISTANCE MINIMUM AND ITS ORIGIN IN La 2/3 Ca 1/3 Mn 1-x Cu x O 3( x =0.15) SYSTEM

作　　者：李广[1] 汤萍[1] 孙霞[1] 姜勇 陈岳[1] 王胜[1] 黄真[1] 袁松柳[1] 

机构地区：[1]中国科学院等离子体物理研究所

出　　处：《物理学报》1999年第3期505-510,共6页Acta Physica Sinica

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．Abstract The temperature dependence of resistance in the La 2/3 Ca 1/3 Mn 1-x Cu x O 3( 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.

关 键 词：LCMCO系统 低温 超导体 电阻极小值 

分 类 号：TM262.014[一般工业技术—材料科学与工程]