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We report resistivity and upper critical field B_c2(T) data for disordered(As deficient) LaO_0.9F_0.1FeAs_1-delta in a wide temperature and high fieldrange up to 60 T. These samples exhibit a slightly enhanced superconductingtransition at T_c = 28.5 K and a significantly enlarged slope dB_c2/dT = -5.4T/K near T_c which contrasts with a flattening of B_c2(T) starting near 23 Kabove 30 T. The latter evidences Pauli limiting behaviour (PLB) with B_c2(0)approximately 63 T. We compare our results with B_c2(T)-data from theliterature for clean and disordered samples. Whereas clean samples show almostno PLB for fields below 60 to 70 T, the hitherto unexplained pronouncedflattening of B_c2(T) for applied fields H II ab observed for severaldisordered closely related systems is interpreted also as a manifestation ofPLB. Consequences are discussed in terms of disorder effects within the framesof (un)conventional superconductivity, respectively.

Evidence for Pauli-limiting behaviour at high fields and enhanced upper critical fields near T_c in several disordered FeAs based Superconductors