Multiferroicity in the square-lattice antiferromagnet of Ba2CoGe2O7

H. T. Yi, Y. J. Choi, S. Lee, S.-W. Cheong

doi:10.1063/1.2937110

Multiferroicity in the square-lattice antiferromagnet of Ba2CoGe2O7

DOI PDF 被引用文献25件

H. T. Yi

Rutgers University 1 Rutgers Center for Emergent Materials and Department of Physics and Astronomy, , Piscataway, New Jersey 08854, USA
Y. J. Choi

Rutgers University 1 Rutgers Center for Emergent Materials and Department of Physics and Astronomy, , Piscataway, New Jersey 08854, USA
S. Lee

Rutgers University 1 Rutgers Center for Emergent Materials and Department of Physics and Astronomy, , Piscataway, New Jersey 08854, USA
S.-W. Cheong

Rutgers University 1 Rutgers Center for Emergent Materials and Department of Physics and Astronomy, , Piscataway, New Jersey 08854, USA

書誌事項

公開日: 2008-05-26

DOI

10.1063/1.2937110

公開者: AIP Publishing

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説明

<jats:p>We have discovered the appearance of ferroelectricity below the Neel temperature of 6.7K in the antiferromagnetic Ba2CoGe2O7 with square magnetic lattice. The ferroelectric polarization is rather small in magnitude and aligned along the c axis, but its magnitude increases remarkably and its direction rotates away smoothly from the c axis when magnetic fields are applied along the c axis. The electric polarization’s behavior of smooth rotation, rather than a sudden flip, is unique. It also accompanies a linear increase in magnetization and a smooth change of dielectric constant with little hysteresis, which may be important for certain technological applications.</jats:p>