The Suppression and Recovery of the Ferroelectric Phase in Multiferroic $MnWO_4$

Details The Suppression and Recovery of the Ferroelectric Phase in Multiferroic $MnWO_4$ The Suppression and Recovery of the Ferroelectric Phase in Multiferroic $MnWO_4$

2008-02-06

arxiv.org/abs/0802.0839v1

Phys. Rev. B 77, 104406 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.77.104406

We report the discovery of a complete suppression of ferroelectricity in $MnWO_4$ by 10 % iron substitution and its restoration in external magnetic fields. The spontaneous polarization in $Mn_{0.9}Fe_{0.1}WO_4$ arises below 12 K in external fields above 4 T. The magnetic/ferroelectric phase diagram is constructed from the anomalies of the dielectric constant, polarization, magnetization, and heat capacity. The observations are qualitatively described by a mean field model with competing interactions and strong anisotropy. We propose that the magnetic field induces a non-collinear inversion symmetry breaking magnetic structure in $Mn_{0.9}Fe_{0.1}WO_4$.

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