Primary ferrotoroidicity in antiferromagnets - Kölner UniversitätsPublikationsServer

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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DOI:10.1103/PhysRevB.92.094431

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:

Creators	Email	ORCID	ORCID Put Code
Toledano, P.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Ackermann, M.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Bohaty, L.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Becker, P.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Lorenz, T.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Leo, N.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Fiebig, M.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED