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The evolution of low-energy spin dynamics in the iron-based superconductorLaFeAsO$_{1-x}$F$_x$ was studied over a broad doping, temperature, and magneticfield range (x = 0 - 0.15, T up to 480K, H up to 30T) by means of As nuclearmagnetic resonance (NMR). An enhanced spin-lattice relaxation rate divided bytemperature, 1/T1T, in underdoped superconducting samples (x = 0.045, 0.05 and0.075) suggests the presence of antiferromagnetic spin fluctuations, which arestrongly reduced in optimally-doped (x = 0.10) and completely absent inoverdoped (x = 0.15) samples. In contrast to previous analysis, Curie-Weissfits are shown to be insufficient to describe the data over the wholetemperature range. Instead, a BPP-type model is used to describe the occurrenceof a peak in 1/T1T clearly above the superconducting transition, reflecting aprogressive slowing down of the spin fluctuations down to the superconductingphase transition.

Progressive slowing down of spin fluctuations in underdoped LaFeAsO$_{1-x}$F$_x$