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In perovskite rare-earth manganites (TbMnO3 and DyMnO3), the incommensurate-commensurate magnetic phase transition is accompanied by a ferroelectric transition, and DyMnO3 exhibits a giant magnetocapacitance effect with a change in dielectric constant of up to 500%. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

June 22, 2004

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Ferroelectricity and Giant Magnetocapacitance in Perovskite Rare-Earth Manganites

TGTakashi GotoYokohama National University TKT. KimuraThe University of Tokyo GLG. LawesWayne State University

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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%.

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Ferroelectricity and Giant Magnetocapacitance in Perovskite Rare-Earth Manganites

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