Electrical transport and magnetoresistance in La0.67Ca0.33MnO3/BaTiO3 composites

被引：26

作者：

Ren, G. M. ^{[1
]}

Yuan, S. L. ^{[1
]}

Guan, H. G. ^{[1
]}

Xiao, X. ^{[1
]}

Yu, G. Q. ^{[1
]}

Miao, J. H. ^{[1
]}

Wang, Y. Q. ^{[1
]}

Yin, S. Y. ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Dept Phys, Wuhan 430074, Peoples R China

来源：

MATERIALS LETTERS | 2007年 / 61卷 / 03期

基金：

中国国家自然科学基金;

关键词：

polycrystalline manganites; magnetoelectric coupling; insulator-metal transition;

D O I：

10.1016/j.matlet.2006.05.057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The results of the structure, electrical transport and magnetoresistance of a ferromagnet-ferroelectric-type La0.67Ca0.33MnO3 (LCMO)/BaTiO3 composites fabricated by the sol-gel method are presented. The structure and morphology characterization indicates no apparent variations in morphology and particle size in spite of the existence of BaTiO3. The insulator-metal transition temperature (T-IM) is shifted to a higher temperature and resistivity decreases with the increase of low content BaTiO3. Magnetoresistance (MR) of the composites is enhanced over the whole temperature range as a result of the introduction of BaTiO3. By calculating in terms of a ferromagnetic grain coupling model, we attribute these transport properties to the enhancement of the ferromagnetic coupling between the neighboring grains, which could be explained by the increase of the carrier concentration at the grain boundary due to the introduction of BaTiO3 and the associated magnetoelectric coupling effect. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：767 / 769

页数：3

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