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We report a systematic study by 75As nuclear-quadrupole resonance inLaFeAsO1-xFx. The antiferromagnetic spin fluctuation (AFSF) found above themagnetic ordering temperature TN = 58 K for x = 0.03 persists in the regime0.04 < x < 0.08 where superconductivity sets in. A dome-shaped x-dependence ofthe superconducting transition temperature Tc is found, with the highest Tc =27 K at x = 0.06 which is realized under significant AFSF. With increasing xfurther, the AFSF decreases, and so does Tc. These features resemble closelythe cuprates La2-xSrxCuO4. In x = 0.06, the spin-lattice relaxation rate (1/T1)below Tc decreases exponentially down to 0.13 Tc, which unambiguously indicatesthat the energy gaps are fully-opened. The temperature variation of 1/T1 belowTc is rendered nonexponential for other x by impurity scattering.

physical review letters

Antiferromagnetic Spin Fluctuation above the Superconducting Dome and  the Full-Gaps Superconducting State in LaFeAsO1-xFx Revealed by 75As-Nuclear  Quadrupole Resonance