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Magnetic ordering and ferroelectricity in multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:mi>H</mml:mi></mml:mrow><mml:mo>โ</mml:mo><mml:mi mathvariant="normal">AgFeO</mml:mi><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>: Comparison between hexagonal and rhombohedral polytypes
Magnetic and dielectric properties of the hexagonal triangular lattice antiferromagnet $2H\text{\ensuremath{-}}{\mathrm{AgFeO}}_{2}$ have been studied by neutron diffraction, magnetic susceptibility, specific heat, pyroelectric current, and dielectric constant measurements. The ferroelectric polarization, $P\ensuremath{\simeq}5\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{C}/{\mathrm{m}}^{2}$, has been found to appear below 11 K due to a polar nature of the magnetic ground state of โฆ