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Paper detail

Contrasting Spin Dynamics Between Underdoped and Overdoped Ba(Fe[1-x]Co[x])2As2

We report the first NMR investigation of spin dynamics in the overdoped non-superconducting regime of Ba(Fe[1-x]Co[x])2As2 up to x =0.26. We demonstrate that the absence of inter-band transitions with large momentum transfer Q(AF) ~ (pi, 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 Q(AF) antiferromagnetic spin fluctuations.

preprint2010arXivOpen access
F. L. NingK. AhilanT. ImaiA. S. SefatM. A. McGuireB. C. SalesD. MandrusP. ChengB. ShenH. -H Wen
cond-mat.supr-concond-mat.str-el
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F. L. NingK. AhilanT. ImaiA. S. SefatM. A. McGuireB. C. SalesD. MandrusP. ChengB. ShenH. -H Wen

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