Contrasting Spin Dynamics between Underdoped and OverdopedBa(Fe1−xCox)2As2 Academic Article uri icon

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abstract

  • We report the first NMR investigation of spin dynamics in the overdoped nonsuperconducting regime of Ba(Fe1-xCox)2As2 up to x=0.26. We demonstrate that the absence of interband transitions with large momentum transfer Q{AF} approximately (pi/a,0) between the hole and electron Fermi surfaces results in complete suppression of antiferromagnetic spin fluctuations for x greater than or approximately 0.15. Our experimental results provide direct evidence for a correlation between T{c} and the strength of Q{AF} antiferromagnetic spin fluctuations.

authors

  • Ning, FL
  • Ahilan, K
  • Imai, Takashi
  • Sefat, AS
  • McGuire, MA
  • Sales, BC
  • Mandrus, D
  • Cheng, P
  • Shen, B
  • Wen, H-H

publication date

  • January 22, 2010