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

  • Solid and Condensed State Physics
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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.

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Authors and Affiliations

  1. Department of Nuclear Chemistry, Eötvös Loránd University, Pázmány P. s. 1/a, Budapest, 1117, Hungary

    Z. Németh, Z. Homonnay & A. Vértes

  2. Research Group for Nuclear Methods in Structural Chemistry, Hungarian Academy of Sciences, Budapest, Hungary

    Z. Klencsár, E. Kuzmann & A. Vértes

  3. Laboratoire de Physique de l’État Condensé, UMR CNRS 6087, Université du Maine, 72085, Le Mans Cedex 9, France

    J. M. Grenèche

  4. Institute for Chemical Technology of Inorganic Materials, Johannes Kepler University, Altenbergerstrasse 69, 4040, Linz, Austria

    B. Lackner, K. Kellner & G. Gritzner

  5. Institute of Nuclear Research of the Hungarian Academy of Sciences, POB 51, 4001, Debrecen, Hungary

    J. Hakl, K. Vad, S. Mészáros & L. Kerekes

Authors
  1. Z. Németh
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  2. Z. Klencsár
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  3. E. Kuzmann
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  4. Z. Homonnay
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  5. A. Vértes
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  6. J. M. Grenèche
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  7. B. Lackner
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  8. K. Kellner
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  9. G. Gritzner
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  10. J. Hakl
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  11. K. Vad
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  12. S. Mészáros
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  13. L. Kerekes
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Correspondence to Z. Németh.

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Németh, Z., Klencsár, Z., Kuzmann, E. et al. The effect of iron doping in La0.8Sr0.2Fe0.05Co0.95O3-δ perovskite. Eur. Phys. J. B 43, 297–303 (2005). https://doi.org/10.1140/epjb/e2005-00057-y

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  • DOI: https://doi.org/10.1140/epjb/e2005-00057-y

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