Phys. Rev. Lett. 92, 257201 (2004) [4 pages]

Ferroelectricity and Giant Magnetocapacitance in Perovskite Rare-Earth Manganites

Abstract

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T. Goto¹, T. Kimura², G. Lawes², A. P. Ramirez³, and Y. Tokura^1,4
¹Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
²Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
³Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA
⁴Spin Superstructure Project, ERATO, Japan Science and Technology Agency, Tsukuba 305-8562, Japan

Received 30 November 2003; published 22 June 2004

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 Δε/ε∼500%.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.92.257201

DOI:

10.1103/PhysRevLett.92.257201

PACS:

75.47.Lx, 64.70.Rh, 75.80.+q

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Phys. Rev. Lett. 92, 257201 (2004) [4 pages]

Ferroelectricity and Giant Magnetocapacitance in Perovskite Rare-Earth Manganites