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Phys. Rev. B 76, 144424 (2007) [7 pages]

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

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Chenglong Jia1, Shigeki Onoda2, Naoto Nagaosa3,4, and Jung Hoon Han5,6,*
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

A systematic microscopic theory of magnetically induced ferroelectricity and lattice modulation is presented for various electron configurations of Mott-insulating transition metal oxides. The origin of polarization is classified as the spin-orbit interaction effective (i) within the magnetic t2g orbitals, (ii) between the t2g and eg orbitals, and (iii) within the ligand ion’s p orbitals. Predictions for x-ray and neutron scattering experiments are proposed to clarify the microscopic mechanism of the spin-polarization coupling in different materials. Semiquantitative agreements with the multiferroic TbMnO3 are obtained.

© 2007 The American Physical Society

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

*hanjh@skku.edu

 
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