Valence-state mixing and separation in SmBaFe2O5+w

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

Research output: Contribution to journalArticleScientificpeer-review

63 Citations (Scopus)


A mixed-valence state, formally denoted as (Formula presented) is observed in the 300 K Mössbauer spectra of the most reduced samples of (Formula presented) Upon cooling below the Verwey-type transition temperature (Formula presented) the component assigned to (Formula presented) separates into a high-spin (Formula presented) state and an (Formula presented) state with an unusually low internal field. The separation of the mixed-valence state at (Formula presented) 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
Number of pages10
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed


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