title: Microscopic origin of the giant ferroelectric polarization in tetragonal-like BiFeO(3).
abstract: We report direct experimental evidence for a room-temperature, ∼130  μC/cm(2) ferroelectric polarization from the tetragonal-like BiFeO(3) 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.
authors: Department of Physics, University of California, Berkeley, California 94720, USA. jinxing@berkeley.edu
authors: J X
authors: JX
authors: Zhang
authors: Q
authors: Q
authors: He
authors: M
authors: M
authors: Trassin
authors: W
authors: W
authors: Luo
authors: D
authors: D
authors: Yi
authors: M D
authors: MD
authors: Rossell
authors: P
authors: P
authors: Yu
authors: L
authors: L
authors: You
authors: C H
authors: CH
authors: Wang
authors: C Y
authors: CY
authors: Kuo
authors: J T
authors: JT
authors: Heron
authors: Z
authors: Z
authors: Hu
authors: R J
authors: RJ
authors: Zeches
authors: H J
authors: HJ
authors: Lin
authors: A
authors: A
authors: Tanaka
authors: C T
authors: CT
authors: Chen
authors: L H
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authors: Tjeng
authors: Y-H
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authors: Chu
authors: R
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authors: Ramesh