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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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References

1. Terasaki, I., Sasago, Y., and Uchinokura, K.: Phys. Rev. B 56 (1997) R12685–R12687.Google Scholar
2. Valla, T. et al. , Nature 417 (2002) 627–630.Google Scholar
3. Funahashi, R. et al. , Jpn. J. Appl. Phys. 39 (2000) L1127–L1129.Google Scholar
4.For example, Singh, D. J., Phys. Rev. B 61 (2000) 13397–13402.Google Scholar
5. Takeuchi, T. et al. , Phy. Rev. B 69 (2004) 125410.Google Scholar
6. Koshibae, W., Tsutsui, K., and Maekawa, S., Phys. Rev. B 62 (2000) 6869–6872. W. Koshibae, and S. Maekawa, Phys. Rev. Lett. 87 (2001) 236603.Google Scholar
7. Kitao, T. et al. , Trans. MRSJ 31 (2006) 367–370. T. Takeuchi et al., Proc. of ICT 2005 (Clemson University, USA, 20 June - 25 June, 2005). S. Kuno et al., Proc. of ICT 2007 (2007/6/3-6/7, Jeju, South Korea).Google Scholar
8. Mikami, M. et al. , Jpn. J. Appl. Phys. 42 (2003) 7383–7386.Google Scholar
9. Foo, M. L. et al. , Phys. Rev. Lett. 92 (2004) 247001.Google Scholar
10. Kondo, T. et al. , Phys. Rev. B 72 (2005) 024533.Google Scholar
11. Takeuchi, T. et al. , Phys. Rev. B 74 (2006) 054206.Google Scholar