UPPER CRITICAL MAGNETIC-FIELDS OF NBC FROM CLEAN TO DIRTY LIMIT

For exceptionally low-defect films of superconducting compound NbC wit h critical temperature T-c=12 K we have researched the upper critical field H-c2(T) and T-c change caused by high-energy He+ ion irradiation . From the dependence of H-c2 on resistivity rho the electron characte ristics have been evaluated. The parallel critical field H-parallel to (T) of the thin films in a vortex-free state and the T-c degradation m echanism were discussed.