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Thermoelectric properties of LaFeAsO1−y at low temperature

Source: J. Appl. Phys. 108, 033703 (2010); doi:10.1063/1.3466990

Published 4 August 2010

KEYWORDS and PACS
Keywords
PACS
  • 74.25.fg
    Thermoelectric effects
  • 74.70.Xa
    Pnictides and chalcogenides
  • 74.62.Dh
    Effects of crystal defects, doping and substitution on superconducting transition temperature
  • YEAR: 2010
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K. Kihou,1,2 C. H. Lee,1,2 K. Miyazawa,1,3 P. M. Shirage,1,2 A. Iyo,1,2,3 and H. Eisaki1,2
1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
2Transformative Research-Project on Iron Pnictides (TRIP), JST, Chiyoda, Tokyo 102-0075, Japan
3Department of Applied Electronics, Tokyo University of Science, Noda, Chiba 278-3510, Japan
We have studied the thermoelectric properties of LaFeAsO1−y in the temperature range 10–300 K. The resistivity decreases with carrier doping induced by oxygen deficiency up to y=0.16. On the other hand, the Seebeck coefficient shows a maximum absolute value at a finite doping level. The power factor (PF) and the dimensionless thermoelectric figure of merit (ZT) in y=0.16 are PF=4.1  mW m−1 K−2 at T=75  K and ZT=0.061 at T=125  K. The results indicate that iron pnictides have potential as a good low temperature thermoelectric material. ©2010 American Institute of Physics
History: Received 8 March 2010; accepted 23 June 2010; published 4 August 2010
Permalink: http://link.aip.org/link/?JAPIAU/108/033703/1

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