Ferroelectricity due to Orbital Ordering in E-Type Undoped Rare-Earth Manganites

被引：30

作者：

Barone, Paolo ^{[1
]}

Yamauchi, Kunihiko ^{[1
]}

Picozzi, Silvia ^{[1
]}

机构：

[1] CNR SPIN, I-67100 Laquila, Italy

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 07期

关键词：

POLARIZATION; PHASE; DISTORTION; CRYSTAL;

D O I：

10.1103/PhysRevLett.106.077201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Aiming at understanding the origin of the electronic contribution to ferroelectric polarization in undoped manganites, we evaluate the Berry phase of orbital-polarizable Bloch electrons as an orbital ordering (OO) establishes in the background of an antiferromagnetic E-type configuration. The onset of OO is tuned by the Jahn-Teller (JT) interaction in a tight-binding model for interacting electrons moving along zigzag chains. A finite polarization is found as soon as the JT coupling is strong enough to induce OO, supporting the large electronic contribution predicted from first principles.

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页数：4

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