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@INPROCEEDINGS{BIESENKAMP:873877,
      author       = {BIESENKAMP, SEBASTIAN and SIDIS, YVAN and QURESHI, NAVID
                      and GORKOV, DMITRY and SCHMALZL, KARIN and SCHMIDT, WOLFGANG
                      and BECKER, PETRA and BOHATÝ, LADISLAV and BRADEN, MARKUS},
      title        = {{D}imerization in the commensurate antiferromagnetic phase
                      of {M}n{WO}4 and {N}a{F}e({WO}4)2},
      reportid     = {FZJ-2020-01069},
      year         = {2020},
      abstract     = {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)},
      month         = {Mar},
      date          = {2020-03-15},
      organization  = {DPG-Frühjahrstagung der Sektion
                       Kondensierte Materie (SKM), Technischen
                       Universität Dresden, Campus
                       Südvorstadt (Germany), 15 Mar 2020 -
                       20 Mar 2020},
      subtyp        = {Invited},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-ILL},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-ILL-20110128},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-Juel1)ILL-IN12-20150421},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/873877},
}