This title appears in the Scientific Report :
2010
Please use the identifier:
http://dx.doi.org/10.1209/0295-5075/89/37006 in citations.
Non-stoichometry and the magnetic structure of Sr2CrO3FeAs
Non-stoichometry and the magnetic structure of Sr2CrO3FeAs
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 +/-...
Saved in:
Personal Name(s): | Tegel, M. |
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Hummel, F. / Su, Y. / Chatterji, T. / Brunelli, M. / Johrendt, D. | |
Contributing Institute: |
JCNS; JCNS Neutronenstreuung; IFF-5 Streumethoden; IFF-4 |
Published in: | epl, 89 (2010) S. 37006 |
Imprint: |
Les Ulis
EDP Sciences
2010
|
Physical Description: |
37006 |
DOI: |
10.1209/0295-5075/89/37006 |
Document Type: |
Journal Article |
Research Program: |
Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung |
Series Title: |
EPL : a Letters Journal Exploring the Frontiers of Physics
89 |
Subject (ZB): | |
Publikationsportal JuSER |
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. |