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

页码：25 / 29

页数：5

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