Spin-polarized tunneling in nanostructured La2/3Sr1/3MnO3

被引：0

作者：

Lamas, DG

Caneiro, A ^{[1
]}

Niebieskikwiat, D

Sánchez, RD

García, D

Alascio, B

机构：

[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[2] Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

来源：

PHYSICA B-CONDENSED MATTER | 2002年 / 320卷 / 1-4期

关键词：

low-field magnetoresistance; spin-polarized tunneling; nanostructured materials;

D O I：

10.1016/S0921-4526(02)00654-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We present magnetic and transport properties of nanocrystalline La2/3Sr1/3MnO3 powders prepared by a gel-combustion method using citric acid as the fuel. The coercive magnetic field H-c is significantly different to the field H*(c) for which the magnetoresistance (MR) is maximum. The MR at low fields (LFMR) exhibits a power-law dependence with magnetization, MR proportional to M-n, with n = 2.5-3.3 for temperatures ranging from 5 to 200 K. The results are discussed in terms of a distribution of particle size in our sample. (C) 2002 Elsevier Science B.V. All rights reserved.

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页码：104 / 106

页数：3

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