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Title: Neutron Laue diffraction study of the complex low-temperature magnetic behaviour of brownmillerite-type Ca2Fe2O5
Authors: Auckett, JE
McIntyre, GJ
Avdeev, M
De Bruyn, H
Tan, TT
Li, S
Ling, CD
Keywords: Diffraction
Laue method
Temperature range 0065-0273 K
Issue Date: 1-Jan-2015
Publisher: International Union of Crystallography
Citation: Auckett, J. E., McIntyre, G. J., Avdeev, M., De Bruyn, H., Tan, T. T., Li, S., & Ling, C. D. (2015). Neutron Laue diffraction study of the complex low-temperature magnetic behaviour of brownmillerite-type Ca2Fe2O5. Journal of Applied Crystallography, 48, 273-279. doi:10.1107/s1600576714027976
Abstract: The atomic and magnetic structure of brownmillerite Ca2Fe2O5 has been refined against single-crystal neutron Laue diffraction data collected at 300, 100 and 10 K under zero-field and low-magnetic field (35 Oe = 35 × 103/4[pi] A m-1) conditions. Ca2Fe2O5 is a canted G-type antiferromagnet with Pcm'n' symmetry, the magnetic moments on Fe being directed approximately along the crystallographic c axis at room temperature. The refinement results show clearly that this magnetic structure persists down to T = 10 K, despite a previous suggestion that an anomalous magnetic susceptibility enhancement observed in Ca2Fe2O5 single crystals between 40 and 140 K might signify a reorientation of the antiferromagnetic easy axis from c to a below 40 K. Alternative explanations for this susceptibility anomaly are considered in terms of the evidence for partial or short-range loss of order in the anomalous regime, possibly due to the presence of multiple competing sublattice interactions. © International Union of Crystallography
Gov't Doc #: 8082
ISSN: 1600-5767
Appears in Collections:Journal Articles

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