Ferroelectric polarization flop in a frustrated magnet MnWO$_4$ induced by magnetic fields

Details Ferroelectric polarization flop in a frustrated magnet MnWO$_4$ induced by magnetic fields Ferroelectric polarization flop in a frustrated magnet MnWO$_4$ induced by magnetic fields

2006-07-19

arxiv.org/abs/cond-mat/0607481v2

Physical Review Letters 97, 097203 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.97.097203

The relationship between magnetic order and ferroelectric properties has been investigated for MnWO$_4$ with long-wavelength magnetic structure. Spontaneous electric polarization is observed in an elliptical spiral spin phase. The magnetic-field dependence of electric polarization indicates that the noncollinear spin configuration plays a key role for the appearance of ferroelectric phase. An electric polarization flop from the b direction to the a direction has been observed when a magnetic field above 10T is applied along the b axis. This result demonstrates that an electric polarization flop can be induced by a magnetic field in a simple system without rare-earth f-moments.

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