Physics – Condensed Matter – Superconductivity
Scientific paper
2008-12-20
J. Phys. Soc. Jpn. 78 (2009) 043703.
Physics
Condensed Matter
Superconductivity
8 pages, 4 figures, submitted to J. Phys. Soc. Jpn
Scientific paper
Electrical resistivities, Hall coefficients and thermoelectric powers have been measured for polycrystalline samples of LaFe1-yCoyAsO1-xFx (x=0.11) with various values of y. The results show that there exists clear distinction of these transport behaviors between the superconducting and nonsuperconducting metallic regions of y divided by the boundary value yc~0.05. We have found that the behaviors in both regions are very similar to those of high-Tc Cu oxides in the corresponding phases. If they reflect, as in the case of Cu oxides, effects of strong magnetic fluctuations, the energy scale of the fluctuations is considered to be smaller than that of the high Cu oxides by a factor of ~1/2. Arguments on the electronic nature and superconducting symmetry are presented on the basis of the observed small rate of the Tc suppression rate by the Co doping.
Kawabata Arisato
Kobayashi Yasuaki
Lee Shih-Chang
Moyoshi Taketo
Sato Masahide
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