Toledano, P., Ackermann, M., Bohaty, L., Becker, P., Lorenz, T., Leo, N. and Fiebig, M. (2015). Primary ferrotoroidicity in antiferromagnets. Phys. Rev. B, 92 (9). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Antiferromagnetic ordering does not give rise to a measurable macroscopic symmetry-breaking order parameter such as the magnetization in a ferromagnet. An exception is the case of antiferromagnets with a vortexlike toroidal alignment of the magnetic moments in the unit cell because this gives rise to the formation of a spontaneous macroscopic toroidal moment which can be measured as a magnetoelectric effect. It is a long-standing question whether the toroidal moment is merely a side effect of the antiferromagnetic state or whether it can become the primary order parameter in a ferroic phase transition. Here we report the magnetoelectric properties of LiFeSi2O6 and show that they point to the role of the toroidal vector moment as the primary order parameter. Based on Landau theory we distinguish it from primary antiferromagnetic order. We thus justify the proposal that along with ferromagnets, ferroelectrics, and ferroelastics the ferrotoroidics constitute a new class of primary ferroics.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Toledano, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ackermann, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bohaty, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Becker, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lorenz, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leo, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fiebig, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-392879
DOI: 10.1103/PhysRevB.92.094431
Journal or Publication Title: Phys. Rev. B
Volume: 92
Number: 9
Date: 2015
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MAGNETIC-STRUCTUREMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/39287

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