Temperature Dependence of the Chemical Potential in Na_xCoO_2 : Implications for the Large Thermoelectric Power(Condensed matter : electronic structure and electrical, magnetic, and optical properties)
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概要
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We have performed a temperature-dependent photoemission study of a Na_xCoO_2 (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 Co^<3+>/Co^<4+> mixed-valence at high temperatures. This suggests that the large thermoelectric power at high temperatures should be considered in the correlated hopping picture.
- 社団法人日本物理学会の論文
- 2007-10-15
著者
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HOSONO Hideo
ERATO-SORST, JST and Frontier Research Center, Tokyo Institute of Technology
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Hosono H
Erato-sorst Jst C/o Frontier Collaborative Research Center (fcrc) Tokyo Institute Of Technology
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Hosono H
Materials And Structures Laboratory Tokyo Institute Of Technology
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FUJIMORI Atsushi
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo
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Hosono Hideo
Tokyo Inst. Technol. Yokohama
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Hosono Hideo
Erato-sorst Japan Science And Technology Agency (jst) In Frontier Collaborative Research Center (fcr
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Ohta Hiromichi
Graduate School Of Engineering Nagoya University
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ISHIDA Yukiaki
Department of Physics, University of Tokyo
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Ishida Yukiaki
Department Of Physics University Of Tokyo
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Fujimori Atsushi
Department Of Complexity Science And Engineering And Department Of Physics University Of Tokyo
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Hosono Hideo
Erato-sorst Japan Science And Technology Agency (jst) And Frontier Research Center Tokyo Institute O
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Fujimori Atsushi
Univ. Tokyo Tokyo
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Ishida Yukiaki
Institute For Chemical Research Kyoto University
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