Abstract
Resistivity broadening of niobium oxy-nitride [Nb(N0.98O0.02)] is analyzed in terms of fluctuation conductivity, thermally activated flux flow (TAFF) and vortex glass study in magnetic fields up to 14 T. Zero field fluctuation analysis of excess conductivity using the Aslamzov-Larkin theory shows an indication of a 3D character that is further supported by the lowest Landau level (LLL) scaling. We could obtain a clear vortex glass region from an extended analysis of the resistivity data. Different regions of interest are estimated that include vortex glass and vortex liquids of the phase diagram. The TAFF has been analyzed using conventional Arrhenius relation, as well as its modified version that includes a temperature- and field-dependent pre-factor. While the conventional TAFF scaling is well suited for the present system, the modified version yields deeper insight into the material parameters of interest. Ginzburg number, coherence length, critical exponents related to the vortex glass transition, etc, are estimated and discussed.
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