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We report the results from resistivity and magnetic measurements onpolycrystalline Ce oxypnictide (CeFeAsO1-xFx) samples where x spans from 0.13to 0.25. We find that the orbital limiting field is as high as 150 T and itsystematically decreases with increasing doping. The Maki parameter is greaterthan one across the phase diagram and the large Maki parameter suggests thatorbital and Pauli limiting effects contribute to the upper critical field. Thebroadening of the superconducting transition in the resistivity data wasinterpreted using the thermally activated flux flow (TAFF) model where we findthat the TAFF activation energy, U0(B), is proportional to B^{-(gamma)} from 1T to high fields, and (gamma) does not significantly change with doping.However, U0 and the superconducting critical current, Jc, are peaked in themid-doping region (x = 0.15 to x = 0.20), and not in the low (x < 0.15) or highdoping (x > 0.20) regions. Furthermore, U0 is correlated with Jc and followsthe two fluid model for granular samples.

physica c superconductivity

Doping dependence of the upper critical field, superconducting current  density and thermally activated flux flow activation energy in  polycrystalline CeFeAsO1-xFx superconductors