This title appears in the Scientific Report : 2020 

Dimerization in the commensurate antiferromagnetic phase of MnWO4 and NaFe(WO4)2
BIESENKAMP, SEBASTIAN
SIDIS, YVAN / QURESHI, NAVID / GORKOV, DMITRY / SCHMALZL, KARIN / SCHMIDT, WOLFGANG / BECKER, PETRA / BOHATÝ, LADISLAV / BRADEN, MARKUS
Streumethoden; JCNS-2
JCNS-ILL; JCNS-ILL
JARA-FIT; JARA-FIT
Streumethoden; PGI-4
2020
DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM), Technischen Universität Dresden, Campus Südvorstadt (Germany), 2020-03-15 - 2020-03-20
Poster
Jülich Centre for Neutron Research (JCNS)
Materials and Processes for Energy and Transport Technologies
Quantum Condensed Matter: Magnetism, Superconductivity
Controlling Collective States
Controlling Collective States
In 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)