摘要
发现在La1/ 3 Nd1/ 3 Ba1/ 3 MnO3 和La1/ 3 Nd1/ 3 Sr1/ 3 MnO3 材料中存在低温电阻率极小值现象·经曲线拟合分析后 ,认为其机理在于材料中存在类似于磁性杂质对传导电子自旋散射造成的近藤效应 (KondoEffect) 。
Intrinsic abnormal minimum electrical resistivity phenomenon at low temperature was observed in Perovskite like La 1/3 Nd 1/3 Ba 1/3 MnO 3 and La 1/3 Nd 1/3 Sr 1/3 MnO 3 Oxides with CMR effect. A theoretical analysis was proposed by a polynomial fitting method, assuming there exists conductive electron spin scattering from located magnetic moments at low temperature besides crystal lattice scattering and interaction between electrons. The phenomenon was identified with the logarithmic dependence of temperature aroused from Kondo like effect and local magnetic ordering. This significant phenomenon implys the complication of the interacting mechanisms in CMR material. The most reasonable explanation for the behaviour is that the partial breaking of the Mn 3+ -O-Mn 4+ electrical conductive bonds, led by the oxygen lattice defects created by component fluctuation during heat treatment, results in inductive diluted magnetic moments which play a equivalent role of magnetic impurity.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2001年第1期111-114,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目! (5 9972 0 0 5
辽宁省自然科学基金资助项目! (972 182 )
关键词
CMR材料
低温电阻率
局域磁有序
KONDO效应
曲线拟合
庞磁电阻效应材料
CMR material
minimum electrical resistivity phenomenon at low temperature
local magnetic ordering
Kondolike effect
polynomial fitting method
