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APS » Phys. Rev. Lett. » Volume 97 » Issue 22

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Phys. Rev. Lett. 97, 227204 (2006) [4 pages]

Ferroelectricity in the Magnetic E-Phase of Orthorhombic Perovskites

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Ivan A. Sergienko,^1,2 Cengiz

en,³ and Elbio Dagotto^1,2
¹Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
²Department of Physics & Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
³National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32310, USA

Received 20 June 2006; published 30 November 2006

Weshow that the symmetry of the spin zigzag chain Ephase of the orthorhombic perovskite manganites and nickelates allows forthe existence of a finite ferroelectric polarization. The proposed microscopicmechanism is independent of spin-orbit coupling. We predict that thepolarization induced by the E-type magnetic order can potentially beenhanced by up to 2 orders of magnitude with respectto that in the spiral magnetic phases of TbMnO₃ andsimilar multiferroic compounds.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.227204
DOI:	10.1103/PhysRevLett.97.227204
PACS:	75.80.+q; 75.50.Ee; 77.80.Fm; 77.84.Dy 75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction 75.50.Ee Antiferromagnetics 77.80.Fm Ferroelectric switching phenomena 77.84.Dy Dielectric, piezoelectric, and ferroelectric niobates, titanates, tantalates, PZT ceramics, etc YEAR: 2006

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