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@ARTICLE{Xiao:9228,
      author       = {Xiao, Y. and Su, Y. and Mittal, R. and Chatterji, T. and
                      Hansen, T. and Price, S. and Kumar, C. M. N. and Persson, J.
                      and Matsuishi, S. and Inoue, Y. and Hosono, H. and Brückel,
                      T.},
      title        = {{N}eutron diffraction study of phase transitions and
                      thermal expansion of {S}r{F}e{A}s{F}},
      journal      = {Physical review / B},
      volume       = {81},
      number       = {9},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-9228},
      pages        = {094523},
      year         = {2010},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The magnetic ordering and crystal structure of iron
                      pnictide SrFeAsF was investigated by using neutron
                      powder-diffraction method. With decreasing temperature, the
                      tetragonal to orthorhombic phase transition is found at
                      180(2) K while the paramagnetic to antiferromagnetic
                      phase-transition set in at 133(3) K. The big difference
                      between structural and magnetic phase transitions in SrFeAsF
                      indicates the weak magnetic exchange coupling between Fe
                      layers. Similar to the parent compound of other
                      iron-pnictide system, the striped Fe magnetism is confirmed
                      in antiferromagnetic phase and the Fe moment of 0.58(6)mu(B)
                      aligned along long a axis. Given the fact that long-range
                      antiferromagnetic order can be described by a power law with
                      beta=0.124(16), SrFeAsF can be treated as a
                      quasi-two-dimensional Ising system. Thermal expansion of
                      orthorhombic phase of SrFeAsF is also investigated. Based on
                      the Gruneisen approximation and Debye approximation for
                      internal energy, the volume of SrFeAsF can be well fitted
                      with Debye temperature of 347(5) K. The experimental
                      atomic-displacement parameters for different
                      crystallographic sites in SrFeAsF are analyzed with Debye
                      model. Thermal expansion analysis for SrFeAsF suggested that
                      the expansion of FeAs layers plays an important role in
                      determining the thermal expansion coefficient.},
      keywords     = {J (WoSType)},
      cin          = {IFF-4 / IFF-5 / Jülich Centre for Neutron Science JCNS
                      (JCNS) ; JCNS / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB784 / I:(DE-Juel1)VDB785 /
                      I:(DE-Juel1)JCNS-20121112 / $I:(DE-82)080009_20140620$},
      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},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000276207300112},
      doi          = {10.1103/PhysRevB.81.094523},
      url          = {https://juser.fz-juelich.de/record/9228},
}