Valence-state mixing and separation in SmBaFe2O5+w

J. Linden, P. Karen, A. Kjekshus, J. Miettinen, T. Pietari, M. Karppinen

    Research output: Contribution to journalArticleScientificpeer-review

    59 Citations (Scopus)
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    Abstract

    A mixed-valence state, formally denoted as Fe2.5+, is observed in the 300 K Mössbauer spectra of the most reduced samples of SmBaFe2O5+w. Upon cooling below the Verwey-type transition temperature (TV≈200K), the component assigned to Fe2.5+ separates into a high-spin Fe3+ state and an Fe2+ state with an unusually low internal field. The separation of the mixed-valence state at TV is also confirmed by magnetic susceptibility measurements and differential scanning calorimetry. A model is proposed which accounts for the variation of the amount of the mixed-valence state with the oxygen content parameter w.
    Original languageEnglish
    Pages (from-to)15251-15260
    JournalPhysical Review B
    Volume60
    Issue number22
    DOIs
    Publication statusPublished - 1999
    MoE publication typeA1 Journal article-refereed

    Keywords

    • iron
    • mössbauer
    • oxygen content

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