Displacement-type ferroelectricity with off-center magnetic ions in perovskite Sr(1-x)Ba(x)MnO3 |
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Authors: | Sakai H Fujioka J Fukuda T Okuyama D Hashizume D Kagawa F Nakao H Murakami Y Arima T Baron A Q R Taguchi Y Tokura Y |
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Affiliation: | Cross-Correlated Materials Research Group, Advanced Science Institute, RIKEN, Wako, Japan. |
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Abstract: | We report a ferroelectric transition driven by the off-centering of magnetic Mn(4+) ions in antiferromagnetic Mott insulators Sr(1-x)Ba(x)MnO(3) with a perovskite structure. As x increases, the perovskite lattice shows the typical soft-mode dynamics, as revealed by the momentum-resolved inelastic x-ray scattering and far-infrared spectroscopy, and the ferroelectricity shows up for x ≥ 0.45. The observed polarization is comparable to that for a prototypical ferroelectric BaTiO(3). We further demonstrate that the magnetic order suppresses the ferroelectric lattice dilation by ~70% and increases the soft-phonon energy by ~50%, indicating the largest magnetoelectric effects yet attained. |
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