Journal
APPLIED PHYSICS LETTERS
Volume 92, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2937110
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We have discovered the appearance of ferroelectricity below the Neel temperature of 6.7 K 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. (c) 2008 American Institute of Physics.
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