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We report 75As NMR measurements of the spin-lattice relaxation in thesuperconducting state of LaFeAsO_(0.9)F_(0.1) and As-deficientLaFeAs_(1-d)O_0.9F_0.1. The temperature behavior of 1/T_1 below T_c changesdrastically from a T^3-dependence for LaFeAsO_(0.9)F_(0.1) to a T^5-dependencefor the As-deficient sample. These results, together with the previouslyreported unexpected increase of T_c and the slope of the upper critical fieldnear T_c for the As-deficient sample, are discussed in terms of non-universalSC gaps in Fe-pnictides and the effect of As deficiency as an exotic case wherenonmagnetic 'smart' impurities even stabilize an s+- wave superconductor orwithin a scenario of a disorder-driven change to s++ superconductivity.

Unusual disorder effects in superconducting LaFeAs_(1-d)O_0.9F_0.1 as revealed by NMR spectroscopy