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This paper is devoted to a comparative study of the AxCoO2 (A = Li, Na and K) systems. For x ~ 0.6, all the investigated alkali cobaltites exhibit a metallic-like behavior. Potassium cobaltites exhibit a T2 dependence of the resistivity - suggesting a Fermi liquid character - and an enhanced Pauli type paramagnetism ascribed to electronic correlations. On the other hand lithium and sodium compounds...
Strong thermoelectric power (TEP) can be achieved in semiconducting oxides when a low carrier density is created by appropriate atomic substitutions or intercalations, but the electrical resistivity remains too large. Actually, oxides such as layered cobaltites for which the best balance between high TEP and small resistivity is reached contain a large concentration of strongly correlated carriers...
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