Microscopic theory of spin-polarization coupling in multiferroic transition metal oxides

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Chenglong Jia,¹ Shigeki Onoda,² Naoto Nagaosa,^3,4 and Jung Hoon Han^5,6
¹School of Physics, Korea Institute for Advanced Study, Seoul 130-012, Korea
²RIKEN (The Institute of Physical and Chemical Research), Wako 351-0918, Japan
³CREST, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
⁴Correlated Electron Research Center, National Institute of Advanced Industrial Science and Technology, 1-1-1, Higashi, Tsukuba 305-8562, Japan
⁵BK21 Physics Research Division, Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea
⁶CSCMR, Seoul National University, Seoul 151-747, Korea

Received 28 August 2007; published 18 October 2007

Asystematic microscopic theory of magnetically induced ferroelectricity and lattice modulationis presented for various electron configurations of Mott-insulating transition metaloxides. The origin of polarization is classified as the spin-orbitinteraction effective (i) within the magnetic t_2g orbitals, (ii) betweenthe t_2g and e_g orbitals, and (iii) within the ligandion's p orbitals. Predictions for x-ray and neutron scattering experimentsare proposed to clarify the microscopic mechanism of the spin-polarizationcoupling in different materials. Semiquantitative agreements with the multiferroic TbMnO₃are obtained.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.76.144424
DOI:	10.1103/PhysRevB.76.144424
PACS:	75.80.+q; 71.70.Ej; 77.80.-e 75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction 71.70.Ej Spin–orbit coupling, Zeeman and Stark splitting, Jahn–Teller effect (condensed matter) 77.80.-e Ferroelectricity and antiferroelectricity YEAR: 2007
KEYWORDS:	electron spin polarisation, ferroelectricity, magnetoelectric effects, manganese compounds, metal-insulator transition, terbium compounds, transition metal compounds

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