From double exchange to superexchange in charge-ordering perovskite manganites

被引：7

作者：

Bao, W ^{[1
]}

Axe, JD

Chen, CH

Cheong, SW

Schiffer, P

Roy, M

机构：

[1] Brookhaven Natl Lab, Upton, NY 11973 USA

[2] AT&T Bell Labs, Murray Hill, NJ 07974 USA

[3] Univ Notre Dame, Notre Dame, IN 46556 USA

来源：

PHYSICA B-CONDENSED MATTER | 1997年 / 241卷

关键词：

double exchange; colossal magnetoresistance; charge ordering; paramagnetic fluctuations;

D O I：

10.1016/S0921-4526(97)00607-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We found dynamic ferromagnetic correlations at the room temperature in perovskite manganites which have an antiferromagnetic insulating ground state. They are replaced by antiferromagnetic correlations when the electrons order. Our results indicate that the double-exchange mechanism is turned off by electron localization at low temperatures. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

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收藏

页码：418 / 420

页数：3

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