Coupled magnetic and structural transitions in EuMn2O5 as studied by neutron diffraction and three-dimensional polarization analysis

被引：51

作者：

Polyakov, V ^{[1
]}

Plakhty, V

Bonnet, M

Burlet, P

Regnault, LP

Gavrilov, S

Zobkalo, I

Smirnov, O

机构：

[1] RAS, Petersburg Nucl Phys Inst, St Petersburg 188300, Russia

[2] CEA, DRFMC, SPSMC, F-38054 Grenoble, France

来源：

PHYSICA B | 2001年 / 297卷 / 1-4期

关键词：

EuMn2O5; simultaneous magnetic and ferroelectric transitions; polar atomic displacements; three-dimensional polarization analysis;

D O I：

10.1016/S0921-4526(00)00851-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A number of magnetic and structural phase transitions in EuMn2 O-5 is observed below T-N similar or equal to 40K by neutron (1/2(0.03)). A ferroelectric transition occurs at T-N with the polar displacements of Mn3+ ions along axis a. Three-dimentional dimensional polarization analysis has shown, that magnetic moments lie in a-c plane down to T-1 similar or equal to 22K. Second structural transition, mainly due to the polar shifts of the Mn4+ ions along c, is observed at T-1. It is accompanied by a magnetic phase transition and by appearance of the b-component of spins. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：208 / 212

页数：5

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