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We report the 75As nuclear magnetic resonance (NMR) measurement of thehole-doped superconductor Ba1-xKxFe2As2 with different lattice parameters anddifferent superconducting volume fractions (Tc = 38K). 75As-NMR spectrarevealed that the magnetically ordered and superconducting phases aremicroscopically separated. The spin-lattice relaxation rate 1/T1 in the normalstate reflects the existence of a large two-dimensional antiferromagnetic spinfluctuation. The 1/T1 in the superconducting state down to the lowestmeasurement temperature T varies close to T^3. In addition, it exhibits nocoherence peak just below Tc. This shows a T dependence similar to those ofother iron pnictides.

75As NMR Study of Hole-Doped Superconductor Ba1-xKxFe2As2 (Tc = 38K)