A dense pellet of the polycrystalline $\mathrm{Sr}\mathrm{Co}{\mathrm{O}}_{3-\delta }$ $(0⩽\delta <0.2)$ 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 $\left[45.7\left(2\right)\mathrm{mJ}{\mathrm{mol}}^{-1}{\mathrm{K}}^{-2}\right]$, indicating a moderate degree of electrons correlation: the mass enhancement factor was 6.1, which is higher than that for the $4d$ ferromagnetic perovskite $\mathrm{Sr}\mathrm{Ru}{\mathrm{O}}_3$ (4.4). The thermoelectric properties of $\mathrm{Sr}\mathrm{Co}{\mathrm{O}}_3$ were found to be sensitive to band filling, in contrast to those of $\mathrm{Sr}\mathrm{Ru}{\mathrm{O}}_3$.

• Received 4 June 2006

DOI:https://doi.org/10.1103/PhysRevB.74.172406