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@ARTICLE{Thoma:859469,
      author       = {Thoma, Henrik and Luberstetter, Wolfgang and Peters,
                      Jürgen and Hutanu, Vladimir},
      title        = {{P}olarized neutron diffraction using a novel high-{T}c
                      superconducting magnet on the single-crystal diffractometer
                      {POLI} at {MLZ}},
      journal      = {Journal of applied crystallography},
      volume       = {51},
      number       = {1},
      issn         = {1600-5767},
      address      = {[S.l.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2019-00325},
      pages        = {17 - 26},
      year         = {2018},
      abstract     = {The polarized single-crystal diffractometer POLI is the
                      first neutron scattering instrument routinely using 3 He
                      spin filters both to produce and to analyse neutron
                      polarization. The instrument, with a non-magnetic
                      goniometer, was designed to perform two types of polarized
                      neutron diffraction experiment: spherical neutron
                      polarimetry, also known as full three-dimensional
                      polarization analysis in zero magnetic field, and classical
                      polarized neutron diffraction, also called the
                      flipping-ratio (FR) method, in high applied magnetic fields.
                      Reported here is the implementation of the FR setup for
                      short-wavelength neutrons on POLI using a new high- T c
                      superconducting magnet with a maximal field of 2.2 T. The
                      complete setup consists of a 3 He polarizer, a nutator, a
                      Mezei-type flipper, guide fields and dedicated pole pieces,
                      together with the magnet. Each component, as well as the
                      whole setup, was numerically simulated, optimized, built and
                      finally successfully tested under real experimental
                      conditions on POLI. The measured polarized neutron spin
                      transport efficiency is about $99\%$ at different
                      wavelengths, e.g. as short as 0.7 Å, and up to the maximal
                      available field of the magnet. No further depolarization of
                      the 3 He cells due to stray fields of the magnet occurs. The
                      additional use of the available 3 He analyser allows
                      uniaxial polarization analysis experiments in fields up to
                      1.2 T. The results of the first experiment on the
                      field-dependent distribution of the trigonal
                      antiferromagnetic domains in haematite (α-Fe 2 O 3 ) are
                      presented and compared with the literature data.},
      cin          = {JCNS-FRM-II / JCNS-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {524 - Controlling Collective States (POF3-524) / 6G15 - FRM
                      II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623) / 6212 - Quantum Condensed
                      Matter: Magnetism, Superconductivity (POF3-621)},
      pid          = {G:(DE-HGF)POF3-524 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6212},
      experiment   = {EXP:(DE-MLZ)POLI-HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000424121500003},
      doi          = {10.1107/S160057671800078X},
      url          = {https://juser.fz-juelich.de/record/859469},
}