Superconductivity of LaFe1-yCo[y]AsO1-xFx

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  • Kawabata Ayaka
    Department of Physics, Division of Material Science, Nagoya University
  • Lee Sang Chul
    Department of Physics, Division of Material Science, Nagoya University
  • Moyoshi Taketo
    Department of Physics, Division of Material Science, Nagoya University
  • Kobayashi Yoshiaki
    Department of Physics, Division of Material Science, Nagoya University
  • Sato Masatoshi
    Department of Physics, Division of Material Science, Nagoya University

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タイトル別名
  • Superconductivity of LaFe<SUB>1−<I>y</I></SUB>Co<I><SUB>y</SUB></I>AsO<SUB>1−<I>x</I></SUB>F<I><SUB>x</SUB></I>
  • Superconductivity of LaFe<sub>1-<i>y</i></sub>Co<sub><i>y</i></sub>AsO<sub>1-<i>x</i></sub>F<sub><i>x</i></sub>

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We have prepared the superconducting system LaFe1−yCoyAsO1−xFx (x=0.11) and carried out measurements of their electrical resistivity ρ and superconducting diamagnetism. 75As- and 135La-NMR studies have also been carried out. The Knight shift observed for 75As has been found to be suppressed by the superconductivity; for 135La, the shift is almost insensitive to the superconductivity. This result presents rather strong experimental evidence for singlet pairing. The Co doping effect on the superconducting transition temperature Tc is not so significant as expected for superconductors with nodes, suggesting that the potential scattering does not seem to primarily suppress the superconductivity. Even for superconductors without nodes, it may not be so trivial to expect this small effect, if there are two different (disconnected) Fermi surfaces whose order parameters have opposite signs. As a possible explanation of the observed Tc suppression, which is found to be small, seems to be related with the loss of the itinerant nature of the electrons.

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