Physics – Condensed Matter – Superconductivity
Scientific paper
2008-08-21
J. Phys. Soc. Jpn. 77 (2008) Suppl. C 147.
Physics
Condensed Matter
Superconductivity
2 pages, 4 fiures, submitted to JPSJ supplement, corrected typos
Scientific paper
LaFe1-yCoyAsO1-xFx (x=0.11) with various y values were prepared and their electrical resistivities, superconducting diamagnetisms and Hall coefficients have been measured. 75As- and 135La-NMR studies have also been carried out In spite of the successful Co-doping, we have not found any meaningful correlation of Tc with y, which indicates that the Tc-suppression by Co-doping is considered not to be so significant as expected for superconductors with nodes. Even for superconductors without nodes, it may not be easy to expect this small effect on Tc, if there are two different (disconnected) Fermi surfaces whose order parameters have opposite signs. The data of the NMR Knight shift indicate that the Cooper pairs are in the singlet state and the spin susceptibility is almost fully suppressed at low temperature.
Kawabata Ayaka
Kobayashi Yoshiaki
Lee Sang Chul
Moyoshi Taketo
Sato* Masatoshi
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