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@INPROCEEDINGS{Chatterji:859540,
      author       = {Chatterji, T. and Brown, P. J. and Sazonov, Andrew and
                      Thoma, Henrik and Deng, H. and Roth, G. and Hutanu,
                      Vladimir},
      title        = {{S}pin reorientation transition about 50 {K} in
                      {H}o{F}e{O}3 studied by polarised neutron diffraction on
                      {POLI}},
      reportid     = {FZJ-2019-00392},
      year         = {2018},
      abstract     = {The onset of electric polarization is observed in HoFeO3
                      below 210 K [1]. Previous neutron diffraction measurements
                      in zero field indicate that magnetic structure do not change
                      from RT down to about 55 K where a spin reorientation
                      transition from a weak ferromagnetic (WF) AFM structure with
                      μ(Fe) ║ [010] and μ(Ho) = 0 (Γ4 symmetry) to μ(Fe) ║
                      [100] and μ(Ho) ≈ 0 (Γ1 symmetry) occur [2]. Polarized
                      neutron studies [3] have shown that 9 T applied parallel to
                      [001] at 70 K aligns a moment of magnitude ≈ 1 μB which
                      is almost entirely due to Ho whilst leaving the arrangement
                      of Fe moments in the WF1 structure with Γ4 symmetry
                      essentially unchanged. New polarised neutron diffraction
                      setup using novel high-Tc superconductor compact magnet with
                      maximal field up to 2.2 T has been recently implemented on
                      POLI [4]. Using this setup the evolution of the magnetic
                      structure in HoFeO3 with temperature and field in the range
                      46-70 K and 0.15-2.2 T were studied using two wavelengths of
                      0.71 Å and 1.15 Å in cooling and heating cycles
                      respectively. The results from POLI are compatible with the
                      previous data. Above 53 K Γ4 WF model with magnetic moments
                      on Fe directed along [010] could be confirmed. Interestingly
                      that in this phase only one WF domain could be identified
                      even by the lowest field. Below 53 K for the lowest field
                      0.15 T almost equal population of opposing 180◦ domains
                      was found, and it is strongly field dependent. The
                      application of the field also lowers the temperature of the
                      transition, until in 2.2 T it does not occur above 47 K.
                      Significant components of the magnetic moment on Fe along
                      [001] could be identified at the intermediate fields of
                      about 1 T below 53 K, indicating that reorientation
                      transition breaks orthorombic symmetry. The resulting
                      monoclinic phase determined from polarised neutron
                      diffraction is a coherent combination of the Γ1 and Γ4
                      structures rather than just a mixture of two phases.
                      References:[1] S. Giri et al. (unpublished results) [2] T.
                      Chatterji, M. Meven, and P. J. Brown (2017) AIP Advances 7
                      045106.[3] T. Chatterji, A. Stunault and P. J. Brown (2017)
                      J. Phys.: Condens. Matter 29 385802.[4] H. Thoma, W.
                      Luberstetter, J. Peters and V. Hutanu (2018) J. Appl. Cryst.
                      51 17.},
      month         = {Jul},
      date          = {2018-07-03},
      organization  = {Polarised Neutrons for
                       Condensed-Matter Investigations 2018,
                       Abingdon (England), 3 Jul 2018 - 6 Jul
                       2018},
      subtyp        = {After Call},
      cin          = {JCNS-FRM-II / JCNS-2 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {524 - Controlling Collective States (POF3-524) / 6212 -
                      Quantum Condensed Matter: Magnetism, Superconductivity
                      (POF3-621) / 6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich
                      Centre for Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-524 / G:(DE-HGF)POF3-6212 /
                      G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)POLI-HEIDI-20140101 /
                      EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/859540},
}