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- W2094433199 abstract "A series of oxygen-deficient n=2 Ruddlesden–Popper phases, Sr3Fe2−xCoxO7−δ (0.25≤x≤1.75), were prepared by solid-state reactions. Temperature-dependent susceptibility and field-dependent magnetization data indicate that for x≥0.25 the dominant magnetic interactions are ferromagnetic. The onset of strong ferromagnetic interactions is evident at ∼200 K, and a transition to a cluster-glass state is observed for all compositions below ∼45 K. The temperature variation of resistivity for all the compounds shows variable-range hopping behavior with two different localization energy scales: one for T<40 K and another for T>80 K. Large negative magnetoresistance (the largest MR ∼−65% for x=0.25) is observed for all phases. The magnetic susceptibility, Mössbauer and X-ray absorption near-edge spectroscopy data indicate that the formal oxidation state of Fe is close to 4+. The key role of d delocalization in the Sr3Fe2−xCoxO7−δ system is compared to the Sr3Fe2−xMnxO7−δ series, where d localization dominates the properties." @default.
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- W2094433199 date "2002-07-01" @default.
- W2094433199 modified "2023-10-17" @default.
- W2094433199 title "Electronic, Magnetic, and Magnetoresistance Properties of the n=2 Ruddlesden–Popper Phases Sr3Fe2−xCoxO7−δ (0.25≤x≤1.75)" @default.
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- W2094433199 doi "https://doi.org/10.1006/jssc.2002.9589" @default.
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