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We report resistivity and upper critical field B_c2(T) data for As deficientLaO_(0.9)F_(0.1)FeAs_(1-delta) in a wide temperature and high field range up to60 T. These disordered samples exhibit a slightly enhanced superconductingtransition at T_c = 29 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. This flattening is interpreted as Pauli limiting behaviour (PLB)with B_(c2)(0) approx 63 T. We compare our results with B_(c2)(T)-data reportedin the literature for clean and disordered samples. Whereas clean samples showno PLB for fields below 60 to 70 T, the hitherto unexplained flattening ofB_(c2)(T) for applied fields H || ab observed for several disordered closelyrelated systems is interpreted also as a manifestation of PLB. Consequences ofour results are discussed in terms of disorder effects within the frame ofconventional and unconventional superconductivity.

journal of low temperature physics

Upper critical field measurements up to 60 T in arsenic-deficient  LaO_(0.9)F_(0.1)FeAs_(1-delta): Pauli limiting behaviour at high fields vs  improved superconductivity at low fields