On the pinning performance analysis in bulk RE-123 twin-free superconductors

We show that the replacement of Bc2 by the irreversibility field in the classical scaling law for the sake of high-Tc superconductors (HTSCs) magnetic data interpretation is not an ideal solution. Field normalization to the peak position is more exact but it also gives rise to parameter values that are too high to be in any correlation with the original theory. Model of the thermally activated vortex dynamics, based on the super-current scaling and on the logarithmic pinning potential, works equally well but with only one reasonably ranging parameter, directly accessible from experiment. This parameter can thus serve as a classification factor for the pinning efficiency of bulk twin-free HTSCs.