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@ARTICLE{Tegel:8899,
      author       = {Tegel, M. and Hummel, F. and Su, Y. and Chatterji, T. and
                      Brunelli, M. and Johrendt, D.},
      title        = {{N}on-stoichometry and the magnetic structure of
                      {S}r2{C}r{O}3{F}e{A}s},
      journal      = {epl},
      volume       = {89},
      issn         = {0302-072X},
      address      = {Les Ulis},
      publisher    = {EDP Sciences},
      reportid     = {PreJuSER-8899},
      pages        = {37006},
      year         = {2010},
      note         = {This work was financially supported by the German Research
                      Foundation (DFG). MT would like to thank Dr K. ROMER for
                      financial support.},
      abstract     = {The iron arsenide Sr2CrO3FeAs with the tetragonal
                      Sr2GaO3CuS-type structure was synthesized and its crystal
                      structure re-determined by neutron powder diffraction. In
                      contrast to previous X-ray crystallographic studies, a mixed
                      occupancy of chromium and iron was found within the FeAs4/4
                      layer (93 +/- $1\%Fe$ : 7 +/- $1\%Cr).$ We suggest that the
                      partial Cr-doping at the Fe site is the reason for the
                      absence of a spin-density-wave anomaly and superconductivity
                      in this compound. Additional experiments via neutron
                      polarization analysis revealed short-range spin correlations
                      below similar to 100 K and long-range antiferromagnetic
                      ordering below T-N = 36 K with a magnetic propagation vector
                      of q = (1/2, 1/2, 0). The Cr3+ -ions form a collinear
                      magnetic structure of the C-type in the magnetic space group
                      C(P)mma' (a' = a-b, b' = a+b, c' = c), where Cr3+-ions
                      occupy the 4g (0, 1/4, z) Wyckoff position. The magnetic
                      moments are aligned along the orthorhombic a'-axis. At 3.5
                      K, an ordered magnetic moment of 2.75 +/- 0.05 mu B for the
                      Cr3+ -sublattice was refined.},
      keywords     = {J (WoSType)},
      cin          = {IFF-4 / IFF-5 / Jülich Centre for Neutron Science JCNS
                      (JCNS) ; JCNS},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB784 / I:(DE-Juel1)VDB785 /
                      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)DNS-20140101},
      shelfmark    = {Physics, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000274848600020},
      doi          = {10.1209/0295-5075/89/37006},
      url          = {https://juser.fz-juelich.de/record/8899},
}