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The NMR results in iron pnictides BaFe2(As1-xPx)2 and Ba(Fe1-xCox)2As2 areanalyzed based on the self-consistent renormalization (SCR) spin fluctuationtheory. The temperature dependence of the NMR relaxation rate (T_1)^{-1} aswell as the electrical resistivity is well reproduced by a SCR model wheretwo-dimensional antiferromagnetic (AF) spin fluctuations are dominant. Thesuccessful description of the crossover feature from non-Fermi liquid to Fermiliquid behavior strongly suggests that low-lying spin fluctuations inBaFe2(As1-xPx)2 and Ba(Fe1-xCox)2As2 possess an itinerant AF nature, and thatchemical substitution in the two compounds tunes the distance of these systemsto an AF quantum critical point. The close relationship between spinfluctuations and superconductivity is discussed compared with the otherunconventional superconductors, cuprate and heavy fermion superconductors. Inaddition, it is suggested that magnetism and lattice instability in thesepnictides are strongly linked via orbital degrees of freedom.

Normal state spin dynamics in the iron-pnictide superconductors BaFe2(As1-xPx)2 and Ba(Fe1-xCox)2As2 probed with NMR measurements