Evidence for valence fluctuation of Fe in Sr_(2)FeMoO_(6-w) double perovskite

J. Linden, T. Yamamoto, M. Karppinen, H. Yamauchi, T. Pietari

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    Abstract

    In this letter evidence for the formation of a valence-fluctuation state of iron, formally denoted as Fe2.5+, is presented. The system under study is the Sr2FeMoO6−w double perovskite, known for exhibiting a very large magnetoresistance. Samples of Sr2FeMoO6−w were synthesized by means of an encapsulation technique utilizing an Fe getter technique and characterized by 57Fe Mössbauer spectroscopy. From 5 K to room temperature the Mössbauer spectrum is dominated by a component with hyperfine parameter values between those expected for high-spin Fe3+ and high-spin Fe2+.
    Original languageEnglish
    Pages (from-to)2925-2927
    JournalApplied Physics Letters
    Volume76
    Issue number20
    DOIs
    Publication statusPublished - 2000
    MoE publication typeA1 Journal article-refereed

    Keywords

    • superconductor

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