Magnetoresistance in manganite/alumina nanocrystalline composites

被引：110

作者：

Hueso, LE

Rivas, J ^{[1
]}

Rivadulla, F

López-Quintela, MA

机构：

[1] Univ Santiago de Compostela, Dept Fis Aplicada, Santiago De Compostela 15706, Spain

[2] Univ Santiago de Compostela, Dept Quim Fis, Santiago De Compostela 15706, Spain

来源：

JOURNAL OF APPLIED PHYSICS | 2001年 / 89卷 / 03期

关键词：

D O I：

10.1063/1.1338518

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnetotransport properties of manganite/insulator composites are studied in this article. By merging the half metallic character of La2/3Ca1/3MnO3 and the mixed composition with alumina grains dispersed in the structure we have been able to increase three times intergranular magnetoresistance around the percolation threshold. The transport properties have been studied employing a theoretical model for ferromagnetic-insulator systems and a two channel equation in order to reproduce the behavior of resistivity in the whole temperature range. The percolation theory is introduced to try to understand and improve the fascinating properties of these mixed systems. (C) 2001 American Institute of Physics.

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页码：1746 / 1750

页数：5

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