Bond distortion effects and electric orders in spiral multiferroic magnets

Abstract

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. We apply our theory to multiferroics cuprates and find that the results are in agreement with experimental observations.

14 pages, 11 figures

References in corpus (18)

• Spin current and magneto-electric effect in non-collinear magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Magnetically driven ferroelectric order in Ni${}_3$V${}_2$O${}_8$
• Ferroelectric polarization flop in a frustrated magnet MnWO${}_4$ induced by magnetic fields
• Spin-polarization coupling in multiferroic transition-metal oxides
• Collinear-to-Spiral Spin Transformation without Changing Modulation Wavelength upon Ferroelectric Transition in Tb1-xDyxMnO3
• Correlation between spin helicity and electric polarization vector in quantum-spin chain magnet LiCu${}_2$O${}_2$
• General Theory for the Ferroelectric Polarization Induced by Spin-Spiral Order
• Strong Dzyaloshinskii-Moriya Interaction and Origin of Ferroelectricity in Cu2OSeO3
• Theory of spin-phonon coupling in multiferroic Mn perovskites
• Giant Ferroelectric Polarization of CaMn7O12 Induced by a Combined Effect of Dzyaloshinskii-Moriya Interaction and Exchange Striction
• Switching the Ferroelectric Polarization by External Magnetic Fields in the Spin = 1/2 Chain Cuprate LiCuVO4
• Spin model of magnetostrictions in multiferroic Mn perovskites
• Microscopic origin of Magnetic Ferroelectrics in Nonlinear Multiferroics
• Microscopic mechanisms of spin-dependent electric polarization in 3d oxides
• Ferroelectricity from spin supercurrents in LiCuVO4
• Relationship between ferroelectricity and Dzyaloshinskii-Moriya interaction in multiferroics and the effect of bond-bending
• Helicoidal magnetic structure and ferroelectric polarization in Cu3Nb2O8

Cited by in corpus (1)

• Electric field control of multiferroic domain wall motion