Displacement-Type Ferroelectricity with Off-Center Magnetic Ions in Perovskite Sr1-xBaxMnO3

被引：142

作者：

Sakai, H. ^{[1
,2
]}

Fujioka, J. ^{[3
]}

Fukuda, T. ^{[4
,5
]}

Okuyama, D. ^{[1
,2
]}

Hashizume, D. ^{[6
]}

Kagawa, F. ^{[7
]}

Nakao, H. ^{[8
]}

Murakami, Y. ^{[8
]}

Arima, T. ^{[9
]}

Baron, A. Q. R. ^{[5
,10
]}

Taguchi, Y. ^{[1
,2
]}

Tokura, Y. ^{[1
,2
,3
,7
]}

机构：

[1] RIKEN, Cross Correlated Mat Res Grp CMRG, Adv Sci Inst, Wako, Saitama 3510198, Japan

[2] RIKEN, CERG, Adv Sci Inst, Wako, Saitama 3510198, Japan

[3] Japan Sci & Technol Agcy, Multiferro Project, Tokyo 1138656, Japan

[4] SPring 8 JAEA, Synchrotron Radiat Res Unit, Mikazuki, Hyogo 6795148, Japan

[5] RIKEN SPring 8 Ctr, Mat Dynam Lab, Mikazuki, Hyogo 6795148, Japan

[6] RIKEN, Adv Technol Support Div, Wako, Saitama 3510198, Japan

[7] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[8] KEK, Inst Mat Struct Sci, Condensed Matter Res Ctr, Tsukuba, Ibaraki 3050801, Japan

[9] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[10] SPring 8 JASRI, Res & Utilizat Div, Hyogo 6795198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 13期

关键词：

MULTIFERROICS; PHYSICS; OXIDES;

D O I：

10.1103/PhysRevLett.107.137601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a ferroelectric transition driven by the off-centering of magnetic Mn4+ ions in antiferromagnetic Mott insulators Sr1-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 x >= 0.45. The observed polarization is comparable to that for a prototypical ferroelectric BaTiO3. We further demonstrate that the magnetic order suppresses the ferroelectric lattice dilation by similar to 70% and increases the soft-phonon energy by similar to 50%, indicating the largest magnetoelectric effects yet attained.

引用

页数：5

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