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000873877 1112_ $$aDPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM)$$cTechnischen Universität Dresden, Campus Südvorstadt$$d2020-03-15 - 2020-03-20$$wGermany
000873877 245__ $$aDimerization in the commensurate antiferromagnetic phase of MnWO4 and NaFe(WO4)2
000873877 260__ $$c2020
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000873877 520__ $$aIn multiferoic MnWO4, the relaxation time of the multiferroic domain inversion shows a peculiar temperature dependence. Upon cooling below the multiferroic transition the relaxation time first increases but becomes faster closer to the commensurate low-temperature phase [1]. We investigated anharmonicities in this material as well as in isostructural NaFe(WO4)2 and propose the enhanced anharmonicities close to the low-temperature magnetic up-up-down-down structure to be responsible for the faster relaxation rates in MnWO4. In both materials there is a similar competition between incommensurate cycloid and commensurate up-up-down-down order, and anharmonic squaring up appears as a precursor in the incommensurate structure [2]. The commensurate magnetic structure is associated with structural dimerization in both materials, that has been quantitatively determined for NaFe(WO4)2 by a four-circle neutron diffraction experiment. [1]: M. Baum, Phys. Rev. B 89, 144406 (2014) [2]: S. Holbein, Phys. Re. B 94, 104423 (2016)
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