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Large thermoelectric power generated by the van Hove singularity in NaxCoO2

Published online by Cambridge University Press:  01 February 2011

Tsunehiro Takeuchi  and
Syuhei Kuno
Tsunehiro Takeuchi
Affiliation:
takeuchi@nuap.nagoya-u.ac.jp, Nagoya University, EcoTopia Science Institute, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan, +81-52-789-4461, +81-52-789-4461
Syuhei Kuno
Affiliation:
kuno@nuap.nagoya-u.ac.jp, Nagoya University, Department of Crystalline Materials Science, Nagoya, 464-8603, Japan
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Abstract

Mechanism leading to the large thermoelectric power and metallic electrical conduction observed in NaxCoO2 was investigated by means of angle resolved photoemission spectroscopy and the Bloch-Boltzmann theory. As a result of thermoelectric power calculation using the experimentally determined electronic structure under the assumptions of rigid band and constant mean free path, NaxCoO2 were found to possess the Boltzmann-type electrical conduction over a wide carrier-concentration range. Analysis using the simplest tight-binding bands revealed that the two-dimensional hexagonal lattices including the crystalline structure of the present NaxCoO2 produce a characteristic spectral conductivity leading to the large thermoelectric power and metallic electrical conduction.

Keywords

thermoelectricityelectronic structureoxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1044: Symposium U – Thermoelectric Power Generation , 2007 , 1044-U02-07
Copyright
Copyright © Materials Research Society 2008

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