Ferroelectricity driven by Y d0-ness with rehybridization in YMnO3 |
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| Authors: | Cho D-Y Kim J-Y Park B-G Rho K-J Park J-H Noh H-J Kim B J Oh S-J Park H-M Ahn J-S Ishibashi H Cheong S-W Lee J H Murugavel P Noh T W Tanaka A Jo T |
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| Institution: | CSCMR & School of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea. |
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| Abstract: | We investigated electronic structure of hexagonal multiferroic YMnO3 using the polarization dependent x-ray absorption spectroscopy (XAS) at O K and Mn L(2,3) edges. The spectra exhibit strong polarization dependence at both edges, reflecting anisotropic Mn 3d orbital occupation. Moreover, the O K edge spectra show that Y 4d states are strongly hybridized with O 2p ones, resulting in large anomalies in Born effective charges on off-centering Y and O ions. These results manifest that the Y d(0)-ness with rehybridization is the driving force for the ferroelectricity, and suggest a new approach to understand the multiferroicity in the hexagonal manganites. |
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