Magnetic and structural phase transitions in YMn2O5 ferromagnetoelectric crystals induced by a strong magnetic field

被引：27

作者：

Popov, YF ^{[1
]}

Kadomtseva, AM ^{[1
]}

Krotov, SS ^{[1
]}

Vorob'ev, GP ^{[1
]}

Kamilov, KI ^{[1
]}

Lukina, MM ^{[1
]}

Tegranchi, MM ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Moscow, Russia

来源：

JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS | 2003年 / 96卷 / 05期

基金：

俄罗斯基础研究基金会;

关键词：

ACKNOWLEDGMENTS This work was supported by the Russian Foundation for Basic Research; project nos. 01-02-16468 and 00-15-96695;

D O I：

10.1134/1.1581951

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetic, magnetoelectric, and magnetoelastic properties of YMn2O5 ferromagnetoelectric single-crystals are investigated in strong pulsed magnetic fields of up to 250 kOe and in static magnetic fields of up to 12 kOe. It is found that, in YMn2O5 at T < T-N = 42 K, a transverse weakly ferromagnetic moment of sigma(0) = 0.8 G cm(3) / g exists that is oriented along axis a and is attributed to the magnetoelectric interaction. When a magnetic field is directed along axis b, which is likely to be the axis of antiferromagnetism, a spin- flop transition is observed that is accompanied by jumps in magnetostriction and electric polarization. When a magnetic field is directed along axis a, the temperature of ferroelectric transition shifts from 20 to 25 K at H approximate to 200 kOe. A theoretical analysis of the experimental results is given within phenomenological theory with regard to the fact that a YMn2O5 compound belongs to noncollinear antiferromagnetic crystals even in the exchange approximation. (C) 2003 MAIK " Nauka/ Interperiodica".

引用

页码：961 / 965

页数：5

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