摘要
实验研究了Ｌａ２／３Ｃａ１／３Ｍｎ１－ｘＣｕｘＯ３（ｘ＝０和０１５）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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第3期505-510,共6页
Acta Physica Sinica
