Microscopic Origin of the Giant Ferroelectric Polarization in Tetragonal-like BiFeO3

被引：315

作者：

Zhang, J. X. ^{[1
]}

He, Q. ^{[1
,2
]}

Trassin, M. ^{[1
]}

Luo, W. ^{[1
,3
]}

Yi, D. ^{[4
]}

Rossell, M. D. ^{[5
]}

Yu, P. ^{[1
]}

You, L. ^{[6
]}

Wang, C. H. ^{[7
]}

Kuo, C. Y. ^{[8
]}

Heron, J. T. ^{[4
]}

Hu, Z. ^{[9
]}

Zeches, R. J. ^{[4
]}

Lin, H. J. ^{[8
]}

Tanaka, A. ^{[10
]}

Chen, C. T. ^{[8
]}

Tjeng, L. H. ^{[9
]}

Chu, Y-H. ^{[1
,4
,7
]}

Ramesh, R. ^{[1
,4
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[3] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[4] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[5] ETH, Dept Mat, CH-8093 Zurich, Switzerland

[6] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA

[7] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan

[8] Natl Synchrotron Radiat Res Ctr, Hsinchu 30077, Taiwan

[9] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[10] Hiroshima Univ, ADSM, Dept Quantum Matter, Higashihiroshima 7398530, Japan

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 14期

关键词：

MAGNETIC-MOMENTS; TEMPERATURE;

D O I：

10.1103/PhysRevLett.107.147602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report direct experimental evidence for a room-temperature, similar to 130 mu C/cm(2) ferroelectric polarization from the tetragonal-like BiFeO3 phase. The physical origin of this remarkable enhancement of ferroelectric polarization has been investigated by a combination of x-ray absorption spectroscopy, scanning transmission electron microscopy, and first principles calculations. A large strain-induced Fe-ion displacement relative to the oxygen octahedra, combined with the contribution of Bi 6s lone pair electrons, is the mechanism driving the large ferroelectric polarization in this tetragonal-like phase.

引用

页数：5

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