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We have performed a temperature-dependent photoemission study of a NaxCoO2(x~0.8) epitaxial thin film prepared by the reactive solid-phase epitaxymethod. The chemical potential shift as a function of temperature was derivedfrom the Co 3d peak shift, and revealed a crossover from the degenerate Fermionstate at low temperatures to the correlated hopping state of Co3+/Co4+mixed-valence at high temperatures. This suggests that the large thermoelectricpower at high temperatures should be considered in the correlated hoppingpicture.Comment: 5 pages, 4 figure

Temperature Dependence of the Chemical Potential in NaxCoO2: Implications for the Large Thermoelectric Power

Temperature Dependence of the Chemical Potential in Na_xCoO₂: Implications for the Large Thermoelectric Power