Displacement-type ferroelectricity with off-center magnetic ions in perovskite Sr1-xBaxMnO3

H. Sakai; J. Fujioka; T. Fukuda; D. Okuyama; D. Hashizume; F. Kagawa; H. Nakao; Y. Murakami; T. Arima; A. Q.R. Baron; Y. Taguchi; Y. Tokura

doi:10.1103/PhysRevLett.107.137601

Displacement-type ferroelectricity with off-center magnetic ions in perovskite Sr_1-xBa_xMnO₃

H. Sakai, J. Fujioka, T. Fukuda, D. Okuyama, D. Hashizume, F. Kagawa, H. Nakao, Y. Murakami, T. Arima, A. Q.R. Baron, Y. Taguchi, Y. Tokura

Research output: Contribution to journal › Article › peer-review

115 Citations (Scopus)

Abstract

We report a ferroelectric transition driven by the off-centering of magnetic Mn4⁺ ions in antiferromagnetic Mott insulators Sr _1-xBa_xMnO₃ 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 x0.45. 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.

Original language	English
Article number	137601
Journal	Physical review letters
Volume	107
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.107.137601
Publication status	Published - 2011 Sep 19
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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Displacement-type ferroelectricity with off-center magnetic ions in perovskite Sr_1-xBa_xMnO₃. / 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.

In: Physical review letters, Vol. 107, No. 13, 137601, 19.09.2011.

Research output: Contribution to journal › Article › peer-review

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abstract = "We report a ferroelectric transition driven by the off-centering of magnetic Mn4+ ions in antiferromagnetic Mott insulators Sr 1-xBaxMnO3 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 x0.45. 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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AU - Sakai, H.

AU - Fujioka, J.

AU - Fukuda, T.

AU - Okuyama, D.

AU - Hashizume, D.

AU - Kagawa, F.

AU - Nakao, H.

AU - Murakami, Y.

AU - Arima, T.

AU - Baron, A. Q.R.

AU - Taguchi, Y.

AU - Tokura, Y.

PY - 2011/9/19

Y1 - 2011/9/19

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AB - We report a ferroelectric transition driven by the off-centering of magnetic Mn4+ ions in antiferromagnetic Mott insulators Sr 1-xBaxMnO3 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 x0.45. 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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