^<59>Co and ^<75>As NMR Investigation of Electron-Doped High T_c Superconductor BaFe_<1.8>Co_<0.2>As_2 (T_c=22K)(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• We report an NMR investigation of the superconductivity in BaFe_2As_2 induced by Co doping (T_c=22K). We demonstrate that Co atoms form an alloy with Fe atoms and donate carriers without creating localized moments. Our finding strongly suggests that the underlying physics of iron-pnictide superconductors is quite different from the widely accepted physical picture of high T_c cuprates as doped Mott insulators. We also show a crossover of electronic properties into a low temperature pseudo-gap phase with a pseudo-gap Δ_<PG>/k_B〜560K, where χ_<spin>〜constant and resisitivty ρ∝T. The NMR Knight shift below T_c decreases for both along the c-axis and ab-plane, and is consistent with the singlet pairing scenario.

• 社団法人日本物理学会の論文
• 2008-10-15

著者

• Mcguire Michael

  Materials Science And Technology Division Oak Ridge National Laboratory

• Mandrus David

  Materials Science And Technology Division Oak Ridge National Laboratory

• Imai Takashi

  Department of Bioscience and Bioinformatics, Ritsumeikan University

• Sales Brian

  Materials Science And Technology Division Oak Ridge National Laboratory

• NING Fanlong

  Department of Physics and Astronomy, McMaster University

• AHILAN Kanagasingham

  Department of Physics and Astronomy, McMaster University

• SEFAT Athena

  Materials Science and Technology Division, Oak Ridge National Laboratory

• JIN Ronying

  Materials Science and Technology Division, Oak Ridge National Laboratory

• Jin Ronying

  Materials Science And Technology Division Oak Ridge National Laboratory

• Sefat Athena

  Materials Science And Technology Division Oak Ridge National Laboratory

• Ning Fanlong

  Department Of Physics And Astronomy Mcmaster University

• Imai Takashi

  Department Of Physics And Astronomy Mcmaster University:canadian Institute For Advanced Research

• Ahilan Kanagasingham

  Department Of Physics And Astronomy Mcmaster University

• Imai Takashi

  Department Of Bioengineering Faculty Of Bioscience And Biotechnology Tokyo Institute Of Technology

• Ning Fanlon

  Department of Physics and Astronomy, McMaster University

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