Magnetoelectric effect due to local noncentrosymmetry

Details Magnetoelectric effect due to local noncentrosymmetry Magnetoelectric effect due to local noncentrosymmetry

2012-04-12

arxiv.org/abs/1204.2771v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 2 figures, 2 tables

Scientific paper

Magnetoelectrics often possess ions located in noncentrosymmetric surroundings. Based on this fact we suggest a microscopic model of magnetoelectric interaction and show that the spin-orbit coupling leads to spin-dependent electric dipole moments of the electron orbitals of these ions, which results in non-vanishing polarization for certain spin configurations. The approach accounts for the macroscopic symmetry of the unit cell and is valid both for commensurate and complex incommensurate magnetic structures. The model is illustrated by the examples of MnWO4, MnPS3 and LiNiPO4. Application to other magnetoelectrics is discussed.

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