Electrical transport and magnetoresistance in La2/3Ca1/3MnO3/BaZrO3 composites

被引：4
|
作者：
Gao, Ling [1 ]
Bai, Lifeng [1 ]
Li, Chengshan [1 ]
Liu, Xianghong [1 ]
Wu, Zhanwen [2 ]
Zheng, Dongning [2 ]
Lu, Yafeng [1 ]
机构：
[1] NW Inst Nonferrous Met Res, Xian 710016, Shaanxi, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 522卷
关键词：
Composite; Percolation conduction; La2/3Ca1/3MnO3; BaZrO3; LOW-FIELD MAGNETORESISTANCE; COLOSSAL MAGNETORESISTANCE; GRAIN-BOUNDARIES; PERCOLATION; JUNCTIONS;
D O I：
10.1016/j.jallcom.2012.01.024
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report the results of electrical resistivity and magnetoresistance (MR) measurements carried out on La2/3Ca1/3MnO3/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 La2/3Ca1/3MnO3 and BaZrO3, although the dependence of the electrical resistivity as a function of La2/3Ca1/3MnO3 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. (C) 2012 Elsevier B. V. All rights reserved.
引用
收藏
页码：25 / 29
页数：5
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