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^{31}P and ^{75}As NMR measurements were performed in superconductingBaFe_2(As_{0.67}P_{0.33})_2 with T_c = 30 K. The nuclear-spin-latticerelaxation rate T_1^{-1} and the Knight shift in the normal state indicate thedevelopment of antiferromagnetic fluctuations, and T_1^{-1} in thesuperconducting (SC) state decreases without a coherence peak just below T_c,as observed in (Ba_{1-x}K_{x})Fe_2As_2. In contrast to other iron arsenidesuperconductors, the T_1^{-1} \propto T behavior is observed below 4K,indicating the presence of a residual density of states at zero energy. Ourresults suggest that strikingly different SC gaps appear inBaFe_2(As_{1-x}P_{x})_2 despite a comparable T_c value, an analogous phasediagram, and similar Fermi surfaces to (Ba_{1-x}K_{x})Fe_2As_2.

^{31}P and ^{75}As NMR evidence for a residual density of states at zero energy in superconducting BaFe_2(As_{0.67}P_{0.33})_2