Phys Rev Lett. 2004 Jun 25;92(25 Pt 1):257201. Epub 2004 Jun 22.

Ferroelectricity and giant magnetocapacitance in perovskite rare-earth manganites.

Goto T, Kimura T, Lawes G, Ramirez AP, Tokura Y.

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Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.

Abstract

The relationships among magnetism, lattice modulation, and dielectric properties have been investigated for RMnO3 (R=Eu, Gd, Tb, and Dy). These compounds show a transition to an incommensurate lattice structure below their Néel temperature, and subsequently undergo an incommensurate-commensurate (IC-C) phase transition. For TbMnO3 and DyMnO3 it was found that the IC-C transition is accompanied by a ferroelectric transition, associated with a lattice modulation in the C phase. DyMnO3 shows a gigantic magnetocapacitance with a change of dielectric constant up to Deltaepsilon/epsilon approximately 500%.

PMID:: 15245056; [PubMed]

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