The effect of iron doping in La0.8Sr0.2Fe0.05Co0.95O3-δ perovskite

Z. Németh (), Z. Klencsár, E. Kuzmann, Z. Homonnay, A. Vértes, J. M. Grenèche, B. Lackner, K. Kellner, G. Gritzner, J. Hakl, K. Vad, S. Mészáros and L. Kerekes

The European Physical Journal B: Condensed Matter and Complex Systems, 2005, vol. 43, issue 3, 297-303

Abstract: La0.8Sr0.257Fe0.05Co0.95O3-δ perovskite is investigated by 57Fe transmission and emission Mössbauer spectroscopy, X-ray diffraction, AC magnetic susceptibility and magnetotransport measurements. Temperature dependence of the 57Fe Mössbauer isomer shift, quadrupole splitting, magnetic hyperfine field, line broadening, and relative spectral area is presented in a detailed manner for La0.8Sr0.257Fe0.05Co0.95O3-δ . The oxidation state of iron is determined to be Fe3+, and the presence of preferential electronic charge compensation Fe3+ ↦ Fe4+ over that of Co3+ ↦ Co4+ is excluded. Relaxation of iron magnetic moments reflected by the 57Fe Mössbauer spectra of La0.8Sr0.257Fe0.05Co0.95O3-δ are interpreted as evidence for the existence of superparamagnetic like Co clusters and a corresponding cluster glass magnetic phase formed below T ≈65 K. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Date: 2005
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DOI: 10.1140/epjb/e2005-00057-y

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