Abstract
The relaxation of the irreversible magnetic momentm(t) inYBa2Cu3O7 (YBCO) films was investigated as a function of temperatureT and the externalmagnetic field H along the c axis applied in zero-field cooling conditions, for the determination ofvortex creep parameters. The data analysis was performed using theT and current density dependence of the normalized vortex creep activation energy, or by the fit of them(t) data with the well known interpolation formula in the framework of the generalvortex creep equation. It was found that (i) even for specimens with strongstatic pinning the characteristic pinning energy remains small in the low-T range, where the vortex creep appearing in standard magnetizationmeasurements is elastic, (ii) the observed strong increase of the timescale for creep and the decrease of the creep exponent with increasingH beyond the theoretical predictions can be attributed to the crossoverelastic-creep–plastic-creep generated by the macroscopic currents inducedin the specimen during magnetization measurements, and (iii) the creepparameters extracted with the interpolation formula are highly affected by them(t) data registeredat short t, which may lead to unphysical creep parameter values.
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