TY - JOUR
T1 - Displacement-type ferroelectricity with off-center magnetic ions in perovskite Sr1-xBaxMnO3
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
N2 - 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.
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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U2 - 10.1103/PhysRevLett.107.137601
DO - 10.1103/PhysRevLett.107.137601
M3 - Article
AN - SCOPUS:80053097090
VL - 107
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 13
M1 - 137601
ER -