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@INPROCEEDINGS{Fabrykiewicz:1034063,
      author       = {Fabrykiewicz, Piotr and Xu, Jianhui and Bhosale,
                      Dnyaneshwar Raghunath and Stekiel, Michal and Roessli,
                      Bertrand and Schmalzl, Karin and Schneidewind, Astrid and
                      Meven, Martin},
      title        = {{M}ysterious incommensurate {D}y3+ magnetic ordering in
                      {D}y{F}e{O}3. {S}pherical neutronpolarimetry study},
      reportid     = {FZJ-2024-06884},
      year         = {2024},
      abstract     = {DyFeO3 is the only known rare-earth orthoferrite with an
                      incommensurate magnetic ordering ofthe rare-earth element
                      without an external magnetic field [1,2]. DyFeO3 establish
                      the ordering ofthe Fe3+ sublattice, according to the Γ4
                      representation (magnetic space group Pb′n′m) below TN=
                      645 K. Below the spin-reorientation temperature TSR ≈ 65 K
                      magnetic moments rotate into theΓ1 (Pbnm.1) Fe3+ structure
                      with symmetry forbidden ferromagnetic component, making it
                      suitablefor spherical neutron polarimetry studies.Our
                      unpolarized single crystal neutron diffraction (IN12, ILL)
                      measurements show the temperatureevolution of DyFeO3
                      satellites at zero magnetic field below 4 K [3]. It is worth
                      comparing it withTbFeO3 [4] which orders incommensurately in
                      a solitonic lattice in the applied magnetic field (~ 3K and
                      H > 1 T). Both show long modulation periods (DyFeO3 280 Å
                      and TbFeO3 340 Å) and higherorder satellites (DyFeO3 up to
                      7th order, TbFeO3 up to 11th order). However, in DyFeO3 the
                      intensityratio between satellites suggests triangular
                      modulation (1/n2), while for TbFeO3 it is square-like
                      (1/n),where n is the satellite order. DyFeO3 and TbFeO3 have
                      different modulation vector directions, [00l]and [0k1],
                      respectively. The formations of incommensurate order in
                      DyFeO3 and TbFeO3 are offirst-order and second-order type,
                      respectively.The incommensurate magnetic order of Tb3+ in
                      TbFeO3 is reported as the solitonic lattice [4], whilefor
                      Dy3+ magnetic ordering in DyFeO3, three models are proposed
                      in the literature: (i) spin densitywave [1], (ii)
                      elliptical-based helical ordering [1], and (iii) spin
                      density wave on the top of commensurateordering [2]. Our
                      half polarization analysis on DyFeO3 [3] shows no magnetic
                      chirality termand our spherical neutron polarimetry analysis
                      supports the spin density wave ordering model overthe
                      helical ordering model (both measured on TASP, PSI).
                      Surprisingly, we observed a high valueof the Pxz component
                      of the polarization matrix measured on magnetic satellite
                      peaks, in contradictionwith all models proposed in the
                      literature [1,2]. According to the Blume-Maleev
                      equations,the Pxz component arises from nuclear-magnetic
                      interference, however, high values of the Pxz termwere
                      observed for (001)±q and (003)±q satellite peaks, which
                      are pure magnetic as (001) and (003)commensurate peaks are
                      nuclear-forbidden. Spherical neutron polarimetry data were
                      collected veryrecently and we are working on the model of
                      the Dy3+ magnetic ordering in DyFeO3.[1] C. Ritter, et al.;
                      J. Phys.: Condens. Matter 34 (2022) 265801; [2] B. Biswas,
                      et al.; Phys. Rev. Mater.6 (2022), 074401; [3] Under
                      preparation; [4] S. Artyukhin, et al.; Nat. Mater. 11 (2012)
                      694},
      month         = {Dec},
      date          = {2024-12-11},
      organization  = {Flipper 2024 as a satellite workshop
                       of the ILL/ESS user meeting, Institut
                       Laue-Langevin (ILL) located on the
                       European Photon and Neutron (EPN)
                       campus (France), 11 Dec 2024 - 13 Dec
                       2024},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT / JCNS-4 / JCNS-ILL},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-4-20201012 / I:(DE-Juel1)JCNS-ILL-20110128},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      experiment   = {EXP:(DE-Juel1)ILL-IN12-20150421},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/1034063},
}