Role of Temperature Dependent Chemical Potential on Thermoelectric Power

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  • Takeuchi Tsunehiro
    EcoTopia Science Institute, Nagoya University Department of Crystalline Materials Science, Nagoya University
  • Toyama Yasuhiro
    Department of Crystalline Materials Science, Nagoya University
  • Yamamoto Akio
    Department of Crystalline Materials Science, Nagoya University

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説明

In this paper, the relation between chemical potential and thermoelectric power is investigated by using the linear response theory, possible models of electronic structure, the consequently obtained spectral conductivities, and high-resolution photoemission spectroscopy. We revealed that the effect of temperature dependent chemical potential on thermoelectric power S(T) is negligibly small when its magnitude is limited below 100 μV/K, but becomes nontrivial with increasing S(T). The validity of this argument we proposed on the basis of theoretical calculation was experimentally confirmed using the high-resolution photoemission spectra of the materials possessing a large magnitude in thermoelectric power.

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