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Updated: Jun 14, 2026

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Contrasting spin dynamics between underdoped and overdoped Ba(Fe1-xCox)2As2
1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S4M1, Canada.
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.
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