Thermal expansion and pressure effect in MnWO4

Details Thermal expansion and pressure effect in MnWO4 Thermal expansion and pressure effect in MnWO4

2007-05-31

arxiv.org/abs/0705.4675v1

Physics

Condensed Matter

Materials Science

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

Scientific paper

10.1016/j.physb.2007.10.327

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.

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