Evidence for Room-Temperature Multiferroicity in a Compound with a Giant Axial Ratio

被引：335

作者：

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

Dupe, B. ^{[3
,4
]}

Fusil, S. ^{[1
,2
,5
]}

Mattana, R. ^{[1
,2
]}

Jacquet, E. ^{[1
,2
]}

Warot-Fonrose, B. ^{[6
]}

Wilhelm, F. ^{[7
]}

Rogalev, A. ^{[7
]}

Petit, S. ^{[8
]}

Cros, V. ^{[1
,2
]}

Anane, A. ^{[1
,2
]}

Petroff, F. ^{[1
,2
]}

Bouzehouane, K. ^{[1
,2
]}

Geneste, G. ^{[3
]}

Dkhil, B. ^{[3
]}

Lisenkov, S. ^{[4
]}

Ponomareva, I. ^{[4
]}

Bellaiche, L. ^{[4
]}

Bibes, M. ^{[1
,2
]}

Barthelemy, A. ^{[1
]}

机构：

[1] CNRS Thales, Unite Mixte Phys, F-91767 Palaiseau, France

[2] Univ Paris 11, F-91405 Orsay, France

[3] Ecole Cent Paris, Lab Struct Proprietes & Modelisat Solids, CNRS, UMR8580, F-92295 Chatenay Malabry, France

[4] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

[5] Univ Evry Val dEssone, F-91025 Evry, France

[6] CNRS, Ctr Elaborat Mat & Etudes Struct, F-31055 Toulouse, France

[7] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[8] CEA, CNRS, Lab Leon Brillouin, UMR12, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 21期

关键词：

BIFEO3; FILMS; POLARIZATION; PEROVSKITE;

D O I：

10.1103/PhysRevLett.102.217603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In the search for multiferroic materials magnetic compounds with a strongly elongated unit-cell (large axial ratio c/a) have been scrutinized intensely. However, none was hitherto proven to have a switchable polarization, an essential feature of ferroelectrics. Here, we provide evidence for the epitaxial stabilization of a monoclinic phase of BiFeO3 with a giant axial ratio (c/a=1.23) that is both ferroelectric and magnetic at room temperature. Surprisingly, and in contrast with previous theoretical predictions, the polarization does not increase dramatically with c/a. We discuss our results in terms of the competition between polar and antiferrodistortive instabilities and give perspectives for engineering multiferroic phases.

引用

页数：5

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