Low-field magnetoresistance of La0.7Ca0.3MnO3 perovskite synthesized by reactive milling method

被引：23
作者：
Manh, D. H. [1 ]
Phong, P. T.
Thanh, T. D. [1 ]
Hong, L. V. [1 ]
Phuc, N. X. [1 ]
机构：
[1] Vietnam Acad Sci & Technol, Inst Mat Sci, Hanoi, Vietnam
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 499卷 / 02期
关键词：
Manganite; Low-field magnetoresistance; Grain size; Spin-polarized tunneling; TRANSPORT-PROPERTIES; MAGNETIC-PROPERTIES; COMPOSITE; MAGNETOTRANSPORT;
D O I：
10.1016/j.jallcom.2010.03.183
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：
Nanocrystalline, granular samples of La0.7Ca0.3MnO3 (LCMO) were synthesized by reactive milling method and annealed at various temperatures. Effect of grain size on the low-field magnetoresistance (LFMR) has been investigated. Based upon a phenomenological model taking into account the spin-polarized transport across grain boundaries, we explained magnetic field dependence of magnetoresistance in LCMO samples. The contribution to the magnetoresistance coming from spin-polarized tunneling was separated out from the intergranular contribution. The fitted results showed that the temperature dependence of the LFMR displays a Curie-Weiss law-like behavior. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：131 / 134
页数：4
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