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The relationship between magnetic order and ferroelectric properties has beeninvestigated for MnWO$_4$ with long-wavelength magnetic structure. Spontaneouselectric polarization is observed in an elliptical spiral spin phase. Themagnetic-field dependence of electric polarization indicates that thenoncollinear spin configuration plays a key role for the appearance offerroelectric phase. An electric polarization flop from the b direction to thea direction has been observed when a magnetic field above 10T is applied alongthe b axis. This result demonstrates that an electric polarization flop can beinduced by a magnetic field in a simple system without rare-earth f-moments.Comment: 9 pages, 4 figure

physical review letters

Ferroelectric Polarization Flop in a Frustrated Magnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>MnWO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>Induced by a Magnetic Field

Ferroelectric Polarization Flop in a Frustrated MagnetMnWO4Induced by a Magnetic Field