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

页码：131 / 134

页数：4

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