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

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

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B. Shen H.-H Wen

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classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords spinantiferromagneticdynamicsfluctuationsoverdopedresultsabsencecomplete

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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.

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

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