Ferroelectricity due to orbital ordering in E-type undoped rare-earth manganites

Details Ferroelectricity due to orbital ordering in E-type undoped rare-earth manganites Ferroelectricity due to orbital ordering in E-type undoped rare-earth manganites

2010-09-17

arxiv.org/abs/1009.3369v2

Physical Review Letters 106, 077201 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, figure and text substantially improved. Title changed

Scientific paper

10.1103/PhysRevLett.106.077201

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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