Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 78, Issue 4, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.043703
Keywords
LaFe1-yCoyAsO1-xFx (x=0.11); electrical resistivity; Hall coefficient; thermoelectric power
Categories
Funding
- Japan Society for the Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports, Science and Technology
- JST, TRIP
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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 a clear distinction of these transport behaviors between the superconducting and nonsuperconducting metallic regions of v divided by the boundary value y(c) similar to 0.05. We have found that the behaviors in both regions are very similar to those of high-T-c Cu oxides in the corresponding phases. If they reflect, as in the case of Cu oxides, the effects of strong magnetic fluctuations, the energy scale of the fluctuations is considered to be smaller than that of the high-T-c Cu oxides by a factor of similar to 1/2. Arguments on the electronic nature and superconducting symmetry are presented on the basis of the observed small rate of the T-c suppression caused by Co doping.
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