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The flux pinning mechanism of NdO0.82F0.18FeAs superconductor made under highpressure, with a critical temperature, Tc, of 51 K, has been investigated indetail in this work. The field dependence of the magnetization and thetemperature dependence of the magnetoresistivity were measured in fields up to13 T. The field dependence of the critical current density, Jc(B), was analyzedwithin the collective pinning model. A crossover field, Bsb, from the singlevortex to the small vortex bundle pinning regime was observed. The temperaturedependence of Bsb(T) is in good agreement with the delta-l pinning mechanism,i.e., pinning associated with fluctuations in the charge-carrier mean freepath, l. Analysis of resistive transition broadening revealed that thermallyactivated flux flow is found to be responsible for the resistivity contributionin the vicinity of Tc. The activation energy U0/kB is 2000 K in low fields andscales as B (-1/3) over a wide field range. Our results indicate that theNdO0.82F0.18FeAs has stronger intrinsic pinning than Bi-2212 and also strongerthan MgB2 for H > 8 T.

Flux pinning mechanism in NdFeAsO0.82F0.18 superconductor: Thermally activated flux flow and charge carrier mean free path fluctuation pinning