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Structural features of the La-Sr-Fe-Co-O system

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Abstract:

A structural study has been performed on the La0.8Sr0.2FexCo1-xO3 (x = 0.025 to 0.3) system displaying large magnetoresistance (MR) at room temperature. A detailed analysis of the crystal structure and microstructure was done by X-ray diffraction (XRD), transmission and scanning electron microscopy (TEM and SEM). The atomic resolution TEM images and the appearing superreflections in the corresponding SAED patterns revealed that a superstructure is formed due to the presence of iron. The correlation between the ordered microstructure and the observed large MR ratio is discussed. 57Fe Mössbauer spectroscopy was utilized to gain information on the valence state of iron in the sample with x = 0.3. The lattice parameters of Fe- doped La0.8Sr0.2FexCo1-xO3 compounds were found to increase monotonously with increasing Fe content. The valence state of iron was found to be Fe3+.

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Authors and Affiliations

  1. Department of Solid State Physics, Eötvös University, 1518 Budapest, POB 32, Hungary, , , , , , HU

    Á. Cziráki, I. Gerőcs, M. Köteles & A. Gábris

  2. Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, 1525 Budapest, POB 49, Hungary, , , , , , HU

    L. Pogány & I. Bakonyi

  3. Research Group for Nuclear Methods in Structural Chemistry of the Hungarian Academy of Sciences, Department of Nuclear Chemistry, Eötvös University, 1518 Budapest, POB 32, Hungary, , , , , , HU

    Z. Klencsár & A. Vértes

  4. Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700032, India, , , , , , IN

    S.K. De, A. Barman, M. Ghosh, S. Biswas & S. Chatterjee

  5. Institut für Festkörper- und Werkstofforschung, Helmholtzstrasse 20, 01069 Dresden, Germany, , , , , , DE

    B. Arnold, H.D. Bauer & K. Wetzig

  6. Institut de Physique et Chimie des Matériaux de Strasbourg, UMR C75040 CNRS-ULP, 23 rue du Loess, 67037 Strasbourg, France, , , , , , FR

    C. Ulhaq-Bouillet & V. Pierron-Bohnes

Authors
  1. Á. Cziráki
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  2. I. Gerőcs
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  3. M. Köteles
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  4. A. Gábris
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  5. L. Pogány
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  6. I. Bakonyi
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  7. Z. Klencsár
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  8. A. Vértes
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  9. S.K. De
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  10. A. Barman
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  11. M. Ghosh
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  12. S. Biswas
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  13. S. Chatterjee
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  14. B. Arnold
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  15. H.D. Bauer
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  16. K. Wetzig
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  17. C. Ulhaq-Bouillet
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  18. V. Pierron-Bohnes
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Received 22 January 2001

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Cziráki, Á., Gerőcs, I., Köteles, M. et al. Structural features of the La-Sr-Fe-Co-O system. Eur. Phys. J. B 21, 521–526 (2001). https://doi.org/10.1007/PL00011125

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  • DOI: https://doi.org/10.1007/PL00011125

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