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 language | English |
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Article number | 037001 |
Journal | Physical Review Letters |
Volume | 104 |
Issue number | 3 |
DOIs | |
State | Published - Jan 22 2010 |