Ferroelectricity driven by Y d0-ness with rehybridization in YMnO3.
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.
CSCMR & School of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
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Cho
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Kim
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Park
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Rho
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JH
Park
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Noh
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BJ
Kim
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Oh
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Park
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Ahn
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Ishibashi
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Cheong
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Lee
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Murugavel
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Noh
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Tanaka
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