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000008899 084__ $$2WoS$$aPhysics, Multidisciplinary
000008899 1001_ $$0P:(DE-HGF)0$$aTegel, M.$$b0
000008899 245__ $$aNon-stoichometry and the magnetic structure of Sr2CrO3FeAs
000008899 260__ $$aLes Ulis$$bEDP Sciences$$c2010
000008899 300__ $$a37006
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000008899 440_0 $$018761$$aEPL : a Letters Journal Exploring the Frontiers of Physics$$v89$$x0302-072X
000008899 500__ $$aThis work was financially supported by the German Research Foundation (DFG). MT would like to thank Dr K. ROMER for financial support.
000008899 520__ $$aThe 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.
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