【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．更多还原

【Abstract】 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.更多还原