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(Color online) Temperature dependence of electrical resistivity of the Sr-Co-O-C single crystal. Both the in-plane and out-of-plane resistivities are displayed. The data follow Eq. (1) below 150 K and Arrhenius relation above 150 K, as shown by the solid curves. The inset shows the temperature dependence of the activation energy estimated from the ρ c-T curve.
Temperature dependence of in-plane thermoelectric power of the Sr-Co-O-C single crystal. The dashed line is described to emphasize the negative sign of the thermoelectric power above 150 K. The inset shows the small value region of the thermoelectric power as an expanded scale. The solid curve is the result of fitting the equation of S = (k B/e)(Δ/k B T + B) to the data, where e, Δ, and B are the electronic charge, the energy gap, and a constant scattering factor, respectively.
(Color online) (a) Temperature dependence of inverse magnetic susceptibility at 10 kOe for the polycrystalline Sr-Co-O-C sample. (b) Magnetization as a function of magnetic field at several temperatures. The solid and dashed curves represent the data obtained upon increasing and decreasing magnetic field, respectively.
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