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@ARTICLE{Waer:190096,
      author       = {Waßer, F. and Schneidewind, A. and Sidis, Y. and Wurmehl,
                      S. and Aswartham, S. and Büchner, B. and Braden, M.},
      title        = {{S}pin reorientation in {B}a $_{0.65}$ {N}a $_{0.35}$ {F}e
                      $_{2}$ {A}s $_{2}$ studied by single-crystal neutron
                      diffraction},
      journal      = {Physical review / B},
      volume       = {91},
      number       = {6},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-03054},
      pages        = {060505},
      year         = {2015},
      abstract     = {We have studied the magnetic ordering in Ba1−xNaxFe2As2
                      with 0.25≤x≤0.4 by unpolarized and polarized neutron
                      diffraction using single crystals. Unlike most FeAs-based
                      compounds that magnetically order, Na-doped BaFe2As2
                      exhibits two successive magnetic transitions: For x=0.35,
                      upon cooling, magnetic order occurs at ∼70 K with in-plane
                      magnetic moments being arranged as in pure or Ni-, Co-, or
                      K-doped BaFe2As2 samples. At a temperature of ∼46 K a
                      second phase transition occurs, which the single-crystal
                      neutron-diffraction experiments can unambiguously identify
                      as a spin reorientation. At low temperatures, the ordered
                      magnetic moments in Ba0.65Na0.35Fe2As2 point along the c
                      direction. The two nearly degenerate magnetic states
                      document orbital degeneracy to persist in the
                      superconducting phase.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)PANDA-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000350251500001},
      doi          = {10.1103/PhysRevB.91.060505},
      url          = {https://juser.fz-juelich.de/record/190096},
}