Specific-heat evidence of strong electron correlations and thermoelectric properties of the ferromagnetic perovskite SrCo O3-δ

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A dense pellet of the polycrystalline SrCo O3-δ (0≤δ<0.2) was obtained by a high-pressure method, and electronic transport properties of the stoichiometric perovskite were measured. A large electronic specific-heat coefficient was found [45.7 (2) mJ mol-1 K-2], indicating a moderate degree of electrons correlation: the mass enhancement factor was 6.1, which is higher than that for the 4d ferromagnetic perovskite SrRu O3 (4.4). The thermoelectric properties of SrCo O3 were found to be sensitive to band filling, in contrast to those of SrRu O3. © 2006 The American Physical Society.

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Physical Review B - Condensed Matter and Materials Physics

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