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@ARTICLE{Chatterji:824329,
      author       = {Chatterji, T. and Meven, M. and Brown, P. J.},
      title        = {{T}emperature evolution of magnetic structure of
                      {H}o{F}e{O}$_3$ by single crystal neutron diffraction},
      reportid     = {FZJ-2016-06938},
      year         = {2016},
      abstract     = {We have investigated the temperature evolution of the
                      magnetic structures of HoFeO$_3$ by single crystal neutron
                      diffraction. The three different magnetic structures found
                      as a function of temperature for \hfo\ are described by the
                      magnetic groups Pb$2_1$, Pbn$2_1$ and Pbn$2_1$ and are
                      stable in the temperature ranges $\approx$ 600-55~K, 55-37~K
                      and 35$>T>2$~K respectively. In all three the fundamental
                      coupling between the Fe sub-lattices remains the same and
                      only their orientation and the degree of canting away from
                      the ideal axial direction varies. The magnetic polarisation
                      of the Ho sub-lattices in these two higher temperature
                      regions, in which the major components of the Fe moment lie
                      along $x$ and $y$, is very small. The canting of the moments
                      from the axial directions is attributed to the antisymmetric
                      interactions allowed by the crystal symmetry. They include
                      contributions from single ion anisotropy as well as the
                      Dzyaloshinski antisymmetric exchange. In the low temperature
                      phase two further structural transitions are apparent in
                      which the spontaneous magnetisation changes sign with
                      respect to the underlying antiferromagnetic configuration.
                      In this temperature range the antisymmetric exchange energy
                      varies rapidly as the the Ho sub-lattices begin to order. So
                      long as the ordered Ho moments are small the antisymmetric
                      exchange is due only to Fe-Fe interactions, but as the
                      degree of Ho order increases the Fe-Ho interactions take
                      over whilst at the lowest temperatures, when the Ho moments
                      approach saturation the Ho-Ho interactions dominate. The
                      reversals of the spontaneous magnetisation found in this
                      study suggest that in \hfo\ the sums of the Fe-Fe and Ho-Ho
                      antisymmetric interactions have the same sign as one
                      another, but that of the Ho-Fe terms is opposite.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15) / 6212 - Quantum Condensed
                      Matter: Magnetism, Superconductivity (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6212},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {1604.08349},
      howpublished = {arXiv:1604.08349},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1604.08349;\%\%$},
      url          = {https://juser.fz-juelich.de/record/824329},
}