Electrical transport and magnetoresistance in La_2/3Ca_1/3MnO₃/BaZrO₃ composites

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• 作者：Ling Gao^a ; Lifeng Bai^a ; Chengshan Li^a ; Xianghong Liu^a ; Zhanwen Wu^b ; Dongning Zheng^b ; Yafeng Lu^a ; ^{yflu@c-nin.com}
• 关键词：Composite ; Percolation conduction ; La2/3Ca1/3MnO3 ; BaZrO3
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 May, 2012
• 卷：522
• 期：Complete
• 页码：25-29
• 文件大小：653 K

摘要

We report the results of electrical resistivity and magnetoresistance (MR) measurements carried out on La_2/3Ca_1/3MnO₃/BaZrO₃ composites prepared by solid state reaction method. The metal-to-insulator transition and the magnitude of magnetoresistance are significantly influenced by the content of BaZrO₃, suggesting the presence of ionic diffusion between La_2/3Ca_1/3MnO₃ and BaZrO₃, although the dependence of the electrical resistivity as a function of La_2/3Ca_1/3MnO₃ volume fraction can be roughly described by classical percolation conduction model. The conductive behavior above the metal-to-insulator transition temperature can be well explained by Mott's variable range hopping model.