Magnetoelectric control of spin-chiral ferroelectric domains in a triangular lattice antiferromagnet

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Kenta Kimura,¹ Hiroyuki Nakamura,¹ Kenya Ohgushi,² and Tsuyoshi Kimura¹
¹Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
²Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

Received 3 September 2008; published 9 October 2008

Wehave grown single crystals of a triangular lattice antiferromagnet (TLA),CuCrO₂, and investigated the correlation between magnetic and dielectric properties.Two magnetic phase transitions are observed at T_N2 [approximate] 24.2 K and T_N123.6 K.It was found that ferroelectric polarization along the triangular latticeplane develops at T_N1, suggesting that the system undergoes atransition into an out-of-plane 120° spin-chiral phase at T_N1. TheTLA provides an opportunity for unique magnetoelectric control of spin-chiralferroelectric domain structures by means of electric and/or magnetic fields.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.78.140401
DOI:	10.1103/PhysRevB.78.140401
PACS:	75.80.+q; 75.30.Kz; 77.80.-e 75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction 75.30.Kz Magnetic phase boundaries 77.80.-e Ferroelectricity and antiferroelectricity YEAR: 2008
KEYWORDS:	antiferromagnetic materials, copper compounds, dielectric polarisation, electric domains, ferroelectricity, magnetic transitions, magnetoelectric effects, permittivity

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