Magnetically Induced Electronic Ferroelectricity in Half-Doped Manganites

被引：52

作者：

Giovannetti, Gianluca ^{[1
,2
,3
,7
]}

Kumar, Sanjeev ^{[1
,2
,3
]}

van den Brink, Jeroen ^{[1
,4
,5
,6
]}

Picozzi, Silvia ^{[7
]}

机构：

[1] Leiden Univ, Inst Lorentz Theoret Phys, Leiden, Netherlands

[2] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands

[3] Univ Twente, MESA Res Inst, NL-7500 AE Enschede, Netherlands

[4] Stanford Univ, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[5] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[6] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 ED Nijmegen, Netherlands

[7] CNR INFM, CASTI Reg Lab, I-67100 Laquila, Italy

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 03期

基金：

欧洲研究理事会;

关键词：

POLARIZATION; MULTIFERROICS; CHARGE;

D O I：

10.1103/PhysRevLett.103.037601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using a joint approach of density functional theory and model calculations, we demonstrate that a prototypical charge ordered half-doped manganite La(1/2)Ca(1/2)MnO(3) is multiferroic. The combination of a peculiar charge-orbital ordering and a tendency to form spin dimers breaks the inversion symmetry and leads to a ferroelectric ground state with a polarization up to several mu C/cm(2). The presence of improper ferroelectricity does not depend on the hotly debated structural details of this material: in the Zener-polaron structure we find a similar ferroelectric response with a large polarization of purely magnetic origin.

引用

页数：4

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