Resistivity Minimum Behavior and Weak Magnetic Disorder Characteristics in La_2/3Ca_1/3MnO₃ Manganites

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• 作者：Zhenping Chen ; Yan Xu ; Yuling Su ; Shixun Cao and Jincang Zhang
• 关键词：Resistivity minimum ; Magnetic disorder ; e ; e Interaction ; Strong correlated system ; Mixed ; valent manganites
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2009
• 出版时间：July, 2009
• 年：2009
• 卷：22
• 期：5
• 页码：465-469
• 全文大小：488.4 KB

文摘

The correlation of low temperature resistivity minimum with magnetic properties was studied by a tuned action in applied magnetic fields for the optimal doping La_2/3Ca_1/3MnO₃ manganite. It is proved that the low temperature minimum results from the existence of intrinsic spin disorder with a weak magnetic disorder characteristic caused from antiferromagnetism background and ferromagnetic ground state. The best fittings were made for the high field, accompanied by disappearing of Kondo term; the electronic resistivity follows only T 1/2 dependence with a characteristic of enhanced e-e interactions and carrier localization. This e-e interaction at low and high fields would be a general characteristic and it reflects the strong correlated interaction between electrons in mixed-valent manganites.