Magnetic properties of Er(Co, Mn)O3 perovskites

被引：26
作者：
Antunes, A. B.
Gil, V.
Moure, C.
Pena, O. [1 ]
机构：
[1] Univ Rennes 1, Sci Chim Rennes, CNRS, UMR 6226, F-35042 Rennes, France
[2] Ctr Univ FEEVALE, GEMA, Novo Hamburgo, RS, Brazil
[3] CSIC, Inst Ceram & Vidrio, Electroceram Dept, E-28049 Madrid, Spain
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2007年 / 27卷 / 13-15期
关键词：
magnetic properties; transition-metal oxides; perovskites; spin reversal;
D O I：
10.1016/j.jeurceramsoc.2007.02.064
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The erbium-based manganite ErMnO3 has been partially Substituted at the manganese site by Co in the general formula ErCoxMn(1-x)O(3). The perovskite orthorhombic structure is found from x(Co) = 0.3 up to x(Co) = 0.7, provided that the synthesis is performed under oxygenation conditions to favour the presence of Co3+. Magnetic properties show unusual phenomena. correlated with the presence of different ma,,netic entities (i.e.. Er3+, CO2+, CO3+, Mn3+, Mn4+): the overall magnetic moment reverses its sip when the sample is cooled under an external magnetic field, while the magnetization loops performed at T < 4K show intersecting branches at low fields and a sudden jump at high fields. A phenomenological model of two interacting sublattices, coupled by an antiferromagnetic exchange interaction, explains the inversion of the overall spin, while the high-field discontinuity is explained in terms of dynamical models. (c) 2007 Elsevier Ltd. All rights reserved.
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页码：3927 / 3930
页数：4
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