Crystal and magnetic structure of YBaCuFeO{sub 5}
Journal Article
·
· Journal of Solid State Chemistry
- Laboratoire CRISMAT-ISMRA, Caen (France); and others
The perovskite-like antiferromagnetic compound YBaCuFeO{sub 5} was studied by powder neutron diffraction, magnetic susceptibility measurements, and Moessbauer spectroscopy. Crystal structure is analyzed in the centrosymmetric space group P4/mmm and compared to previous results in the noncentrosymmetric space group P4mm. Fe/Cu atoms occupy randomly the oxygen pyramids with iron displaced inside the pyramid with respect to the copper position. The magnitude and the distribution of the quadrupolar splitting obtained by electric field gradient calculations, taking into account the cationic disorder, are in qualitative agreement with those observed by Moessbauer spectroscopy in the paramagnetic range. Magnetic susceptibility and neutron powder diffraction reveal two magnetic transitions at T{sub N1} = 441(2) K and T{sub N2} {approx} 230 K. Between T{sub N1} and T{sub N2}, the magnetic structure is based on a unit cell related to that of the nuclear structure by a{sub mag} = {radical}2a{sub nuc} and c{sub mag} = 2c{sub nuc}. The magnetic moments are coupled antiferromagnetically within each [CuFeO{sub 5}]{infinity} layer with the stacking sequence along c: +--+. The magnetic structure is refined with moments tilted with respect to the c axis. The large reduction of magnetic moment observed by neutron powder diffraction is explained by the cationic disorder. Below T{sub N2} the magnetic structure is incommensurate with a short-range order.
- OSTI ID:
- 552724
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 114; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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