Date of this Version
Journal of Applied Physics
Ferroelectricity has been found to occur in several insulating systems, such as TbMnO3 and Ni3V2O8 which have more than one phase with incommensurately modulated long-range magnetic order. Here we give a phenomenological model which relates the symmetries of the magnetic structure as obtained from neutron diffraction to the development and orientation of a spontaneous ferroelectric moment induced by the magnetic ordering. This model leads directly to the formulation of a microscopic spin-phonon interaction which explains the observed phenomena. The results are given in terms of gradients of the exchange tensor with respect to generalized displacements for the specific example of NVO. It is assumed that these gradients will now be the target of first-principles calculations using the LDA+U or related schemes
Reprinted with permission from the Journal of Applied Physics. Copyright 2006, American Institute of Physics.
Harris, A. (2006). Ferroelectricity Induced by Incommensurate Magnetism (Invited). Journal of Applied Physics, 99 08E303-1-08E303-6. http://dx.doi.org/10.1063/1.2177392
Date Posted: 12 August 2015
This document has been peer reviewed.