Contrasting Spin Dynamics between Underdoped and Overdoped Ba(Fe1-xCox)2As2

F. L. Ning, K. Ahilan, T. Imai, A. S. Sefat, M. A. McGuire, B. C. Sales, D. Mandrus, P. Cheng, B. Shen, H. H. Wen

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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 QAF∼(π/a,0) between the hole and electron Fermi surfaces results in complete suppression of antiferromagnetic spin fluctuations for x 0.15. Our experimental results provide direct evidence for a correlation between Tc and the strength of QAF antiferromagnetic spin fluctuations.

Original languageEnglish
Article number037001
JournalPhysical Review Letters
Volume104
Issue number3
DOIs
StatePublished - Jan 22 2010

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