Spin Susceptibility, Phase Diagram, and Quantum Criticality in the Eelctron-Doped High Tc Superconductor Ba(Fe1-xCox)2As2 Academic Article uri icon

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  • We report a systematic investigation of Ba[Fe(1-x)Co(x)]2As2 based on transport and 75-As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping progressively suppresses the uniform spin susceptibility and low frequency spin fluctuations. The optimum superconducting phase emerges at x_c~0.08 when the tendency toward spin ordering completely diminishes. Our findings point toward the presence of a quantum critical point near x_c between the SDW (spin density wave) and superconducting phases.


  • Ning, Fanlong
  • Ahilan, Kanagasingham
  • Imai, Takashi
  • S. Sefat, Athena
  • Jin, Ronying
  • A. McGuire, Michael
  • C. Sales, Brian
  • Mandrus, David

publication date

  • January 15, 2009