Magnetoresistance effect in the fluctuating-valence BaSmFe_(2)O_(5+w) system

J. Nakamura, J. Linden, M. Karppinen, H. Yamauchi

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    The occurrence of negative magnetoresistance (MR) in semiconductive BaSmFe2O5+w double-perovskite samples is demonstrated. A peak in the MR value was observed at the Verwey–type transition temperature. The transition signifies the charge separation of the Fe2.5+ fluctuating mixed valence state into high-spin Fe2+ and Fe3+. The samples were ferrimagnetic with a Curie temperature of ∼710 K. Upon oxidizing/reducing the samples the size of the MR peak and the temperature at which the peak occurred varied. The largest MR value observed was 1.4% at 7 T.
    Original languageEnglish
    Pages (from-to)1683-1685
    JournalApplied Physics Letters
    Issue number11
    Publication statusPublished - 2000
    MoE publication typeA1 Journal article-refereed


    • superconductor


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