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The magnitude and anisotropy of the critical current density J c as well as the irreversibility field H irr of BaZrO 3 (BZO)-doped YBa 2 Cu 3 O 7 − x (YBCO) thin films are determined by both the amount of BZO and the deposition temperature. The influence of these two parameters was investigated on BZO/YBCO quasi-multilayers in two temperature series with different doping amounts (4 and 9 vol% BZO). The deposition temperature was varied between 790 and 850 °C. The samples show an increase in H irr , logarithmic peaks in J c ( B ) and strong c -axis peaks in J c (θ). Nevertheless, the two series reveal opposite temperature trends for J c : whereas J c increases with temperature for 4 vol% BZO, it decreases for 9 vol%. This is explained by a diffusion model for the formation and growth of BZO nanocolumns and an optimum balance between correlated and random pinning centres for high J c . TEM images support this model.
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Kießling et al. (2011) studied this question.
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