Multiferroicity and spiral magnetism in FeVO4 with quenched Fe orbital moments

被引：41

作者：

Daoud-Aladine, A. ^{[1
]}

Kundys, B. ^{[2
]}

Martin, C. ^{[2
]}

Radaelli, P. G. ^{[1
,4
]}

Brown, P. J. ^{[3
]}

Simon, C. ^{[2
]}

Chapon, L. C. ^{[1
]}

机构：

[1] STFC, Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[2] 6508 ENSI CAEN, Lab CRISMAT, UMR, F-14050 Caen, France

[3] Inst Laue Langevin, F-38042 Grenoble 9, France

[4] UCL, Dept Phys & Astron, London WC1E 6BT, England

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 22期

关键词：

crystal structure; iron; iron compounds; magnetic moments; magnetic structure; multiferroics; neutron diffraction; polarisation; specific heat; spin dynamics;

D O I：

10.1103/PhysRevB.80.220402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

FeVO4 has been studied by heat capacity, magnetic susceptibility, electric polarization and single-crystal neutron-diffraction experiments. The triclinic crystal structure is made of S-shaped clusters of six Fe3+ ions, linked by VO43- groups. Two long-range magnetic ordering transitions occur at T-N1=22 K and T-N2=15 K. Both magnetic structures are incommensurate and below T-N2, FeVO4 becomes weakly ferroelectric coincidentally with the loss of the collinearity of the magnetic structure in a very similar fashion than in the classical TbMnO3 multiferroic material. However we argue that the symmetry considerations and the mechanisms invoked to explain these properties in TbMnO3 do not straightforwardly apply to FeVO4. First, the magnetic structures, even the collinear structure, are all acentric so that ferroelectricity in FeVO4 is not correlated with the fact magnetic ordering is breaking inversion symmetry. Regarding the mechanism, FeVO4 has quenched orbital moments that questions the exact role of the spin-orbit interactions.

引用

页数：4

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