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We report upper critical field B_c2(T) data for disordered(arsenic-deficient) LaO_0.9F_0.1FeAs_(1-delta) in a wide temperature andmagnetic field range up to 47 T. Because of the large linear slope of Bc2 about-5.4 T/K to -6.6 T/K near Tc = 28.5 K the T-dependence of the in-plane Bc2(T)shows a flattening near 23 K above 30 T which points to Pauli-limited behaviorwith Bc2(0) about 63-68 T. Our results are discussed in terms of disordereffects within conventional and unconventional superconducting pairings.

physical review letters

High-Field Pauli-Limiting Behavior and Strongly Enhanced Upper Critical  Magnetic Fields near the Transition Temperature of an Arsenic-Deficient  LaO_0.9F_0.1FeAs_(1-\delta) Superconductor