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Spin-polarization coupling in multiferroic transition-metal oxides

Chenglong Jia·Shigeki Onoda·Naoto Nagaosa·Jung Hoon Han
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Abstract

A systematic microscopic theory of magnetically induced ferroelectricity and lattice modulation is presented for all electron configurations of Mott-insulating transition-metal oxides. Various mechanisms of polarization are identified in terms of a strong-coupling perturbation theory. Especially, the spin-orbit interaction acting on the ligand p orbitals is shown to give the ferroelectric polarization of the spin-current form, which plays a crucial role particularly in eg systems. Semiquantitative agreements with the multiferroic TbMnO3 are obtained. Predictions for X-ray and neutron scattering experiments are proposed to clarify the microscopic mechanism of the spin-polarization coupling in different materials.

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Chenglong Jia, Shigeki Onoda, Naoto Nagaosa, Jung Hoon Han. 2007-01-25. Spin-polarization coupling in multiferroic transition-metal oxides. https://doi.org/10.1103/physrevb.76.144424

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