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@ARTICLE{Chatterji:6008,
      author       = {Chatterji, T. and Schneider, G. J.},
      title        = {{A}nomalous hyperfine interaction in {C}o{F}2 investigated
                      by high resolution neutron spectroscopy},
      journal      = {Journal of physics / Condensed matter},
      volume       = {21},
      issn         = {0953-8984},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-6008},
      pages        = {436008},
      year         = {2009},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We investigated the low energy excitations in CoF(2) in the
                      µeV range with a back-scattering neutron spectrometer. The
                      energy scans on a CoF(2) powder sample revealed inelastic
                      peaks at E = 0.728 ± 0.008 µeV at T = 3.46 K on both
                      energy gain and energy loss sides. The inelastic peaks move
                      gradually towards lower energy with increasing temperature
                      and finally merge with the elastic peak at the electronic
                      magnetic ordering temperature T(N)≈37 K. We interpret the
                      inelastic peaks to be due to the transition between the
                      hyperfine-split nuclear level of the (59)Co isotopes with
                      spin I = 7/2. We have shown that the energy of the inelastic
                      peak or the hyperfine splitting in CoF(2) can be treated as
                      an order parameter of the antiferromagnetic phase transition
                      and yields the critical exponent β = 0.313 ± 0.007,
                      consistent with the neutron diffraction results and also the
                      three-dimensional Ising character of the magnetic system.
                      The determined hyperfine splitting in CoF(2) deviates from
                      the linear relationship between the ordered electronic
                      magnetic moment and the hyperfine splitting in Co, Co-P
                      amorphous alloys and CoO, presumably due to the presence of
                      an unquenched orbital moment.},
      keywords     = {J (WoSType)},
      cin          = {IFF-4 / IFF-5 / JARA-FIT / Jülich Centre for Neutron
                      Science JCNS (JCNS) ; JCNS},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB784 / I:(DE-Juel1)VDB785 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-20121112},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung / Großgeräte für die Forschung
                      mit Photonen, Neutronen und Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK505 / G:(DE-Juel1)FUEK415},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:21832454},
      UT           = {WOS:000270642700023},
      doi          = {10.1088/0953-8984/21/43/436008},
      url          = {https://juser.fz-juelich.de/record/6008},
}