Large low-field magnetoresistance and TC in polycrystalline (Ba0.8Sr0.2)2-xLaxFeMoO6 double perovskites

被引：98

作者：

Serrate, D ^{[1
]}

De Teresa, JM

Blasco, J

Ibarra, MR

Morellón, L

Ritter, C

机构：

[1] Univ Zaragoza, Fac Ciencias, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

APPLIED PHYSICS LETTERS | 2002年 / 80卷 / 24期

关键词：

D O I：

10.1063/1.1485119

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Large low-field magnetoresistance (LFMR) together with high Curie temperatures (T-C) are requirements for some applications in magnetoelectronics. In order to optimize both parameters, we have investigated double perovskites (Ba0.8Sr0.2)(2-x)LaxFeMoO6 (0less than or equal toxless than or equal to0.4). High-temperature neutron diffraction measurements indicate a strong increase in T-C with La doping (from approximate to345 K for x=0 to approximate to405 K for x=0.4). The LFMR is very large for x=0 (at 10 KOeapproximate to27% at 10 K and approximate to7% at 290 K) and decreases with La doping. This decrease cannot be attributed to a substantial enhancement of Fe/Mo antisite disorder, which is small as tracked by means of x-ray and high-resolution neutron diffraction, but to grain boundaries modifications. (C) 2002 American Institute of Physics.

引用

页码：4573 / 4575

页数：3

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