量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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We report an x-ray emission spectroscopy study of the local fluctuating magnetic moment (mu_bare) in NaFe1-????xCoxAs and NaFe1????-xCuxAs. In NaFeAs, the reduced height of the As ions induces a local magnetic moment higher than BaFe2As2 despite lower T_N and ordered magnetic moment. As NaFeAs is doped with Co, mu_bare is slightly reduced, whereas Cu doping leaves it unaffected, indicating a different doping mechanism: based on electron counting for Co, whereas impurity scattering dominates in the case of Cu. Finally, we observe an increase in mu_bare with temperature in all samples as observed in electron- and hole-doped BaFe2As2. Since both Co and Cu doping display superconductivity, our findings demonstrate that the formation of Cooper pairs is not connected with the complete loss of fluctuating paramagnetic moments.
Fluctuating magnetism of Co- and Cu-doped NaFeAs
