Thermal expansion and pressure effect in MnWO4

Abstract

MnWO4 has attracted attention because of its ferroelectric property induced by frustrated helical spin order. Strong spin-lattice interaction is necessary to explain ferroelectricity associated with this type of magnetic order.We have conducted thermal expansion measurements along the a, b, c axes revealing the existence of strong anisotropic lattice anomalies at T1=7.8 K, the temperature of the magnetic lock-in transition into a commensurate low-temperature (reentrant paraelectric) phase. The effect of hydrostatic pressure up to 1.8 GPa on the FE phase is investigated by measuring the dielectric constant and the FE polarization. The low- temperature commensurate and paraelectric phase is stabilized and the stability range of the ferroelectric phase is diminished under pressure.

2 pages, 3 figures. SCES conference proceedings, houston, TX, 2007. to be published in Physica B

References in corpus (4)

• Ferroelectricity in spiral magnets
• Ferroelectric polarization flop in a frustrated magnet MnWO${}_4$ induced by magnetic fields
• Structural Anomalies at the Magnetic and Ferroelectric Transitions in $RM{n}_2{O}_5$ (R=Tb, Dy, Ho)
• Pressure-Temperature Phase Diagram of Multiferroic $N{i}_3{V}_2{O}_8$

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• The Suppression and Recovery of the Ferroelectric Phase in Multiferroic $MnW{O}_4$
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• The complex multiferroic phase diagram of Mn${}_{1-x}$Co${}_x$WO${}_4$
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• Domain dynamics in LiCuVO${}_4$: Evidence for polarized nanoregions
• High-pressure synthesis, crystal and electronic structures of a new scandium tungstate, Sc0.67WO4
• Structural dimerization in the commensurate magnetic phases of NaFe(WO${}_4$)${}_2$ and MnWO${}_4$
• The effect of pressure in the crystal and magnetic structure of FeWO4
• Persistent type-II multiferroicity in nanostructured MnWO4 ceramics