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

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

2005-11-07

arxiv.org/abs/cond-mat/0511149v2

J. Phys. Soc. Jpn., Vol.76, No.10, p.103709 (2007), selected as "Papers of Editors' Choice"

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1143/JPSJ.76.103709

We have performed a temperature-dependent photoemission study of a NaxCoO2 (x~0.8) epitaxial thin film prepared by the reactive solid-phase epitaxy method. The chemical potential shift as a function of temperature was derived from the Co 3d peak shift, and revealed a crossover from the degenerate Fermion state at low temperatures to the correlated hopping state of Co3+/Co4+ mixed-valence at high temperatures. This suggests that the large thermoelectric power at high temperatures should be considered in the correlated hopping picture.

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