Abstract
We report $^{75}\text{A}\text{s}$ NMR studies on $\text{LaFeAs}({\text{O}}_{1\ensuremath{-}x}{\text{F}}_{x})$ $(0\ensuremath{\le}x\ensuremath{\le}0.14)$. At $x=0.04$ near the phase boundary, from resistivity, spin-lattice relaxation rate $1/{T}_{1}$, and NMR spectrum measurements, we found weak magnetic order at ${T}_{N}\ensuremath{\simeq}30\text{ }\text{K}$. Antiferromagnetic (AFM) fluctuations proved through $1/{T}_{1}$ are suppressed significantly with F doping, and pseudogap behavior without pronounced AFM fluctuations is observed at $x=0.11$ where ${T}_{C}$ is maximum. This significant suppression of $1/{T}_{1}T$ upon F doping while ${T}_{C}$ remains nearly unchanged suggests that low-energy AFM fluctuations probed with $^{75}\text{A}\text{s}$ NMR do not play a crucial role in the superconductivity.
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