Bond distortion effects and electric orders in spiral multiferroic magnets

Details Bond distortion effects and electric orders in spiral multiferroic magnets Bond distortion effects and electric orders in spiral multiferroic magnets

2012-03-25

arxiv.org/abs/1203.5469v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We study in this paper bond distortion effect on electric polarization in spiral multiferroic magnets based on cluster and chain models. The bond distortion break inversion symmetry and modify the $d$-$p$ hybridization. Consequently, it will affect electric polarization which can be divided into spin-current part and lattice-mediated part. The spin-current polarization can be written in terms of $\vec{e}_{i,j}\times(\vec{e}_{i}\times\vec{e}_{j})$ and the lattice-mediated polarization exists only when the M-O-M bond is distorted. The electric polarization for three-atom M-O-M and four-atom M-O$_{2}$-M clusters is calculated. We also study possible electric ordering in three kinds of chains made of different clusters.

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