The magnetoresistance effect of La-Ca-Sr-Mn-O perovskites under a very low magnetic field

被引：16

作者：

Fu, YL ^{[1
]}

Ong, CK ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 19260, Singapore

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2000年 / 208卷 / 1-2期

关键词：

perovskites; resistivity; magnetoresistance; insulator-metal transition; second doping method;

D O I：

10.1016/S0304-8853(99)00557-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The bulk polycrystalline samples of La0.7Ca0.1Sr0.2MnO3, La0.7Ca0.15Sr0.15MnO3 and La0.7Ca0.25Sr0.05MnO3 have been synthesized by doping La0.7Ca0.3MnO3 with La0.7Sr0.3MnO3 (second doping method). The MR effect for three samples has been investigated under low magnetic field. A quite large (-19.5%) negative magnetoresistance ratio has been obtained in La0.7Ca0.25Sr0.05MnO3 under only 0.1 T magnetic field. The MR peaks relative to the preparation method are observed in all three samples around temperature 100 K, well below the insulator-metal transition temperature T-t (260-270 K), and it is not affected very much by Sr2+ density. MR exists in a wide temperature range. The MR effect can be explained as a result of the presence of grain boundaries. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：69 / 73

页数：5

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