Vortex creep in YBa 2 Cu 3 O 7 − x (YBCO) films grown from the trifluoracetate (TFA) chemical route with BaZrO 3 and Ba 2 YTaO 6 second-phase nanoparticles (NPs) has been investigated by magnetic relaxation measurements. We observe that in YBCO nanocomposites the phenomenological crossover line from the elastic to the plastic creep regime is shifted to higher magnetic fields and temperatures. The origin of this shift lies on the new isotropic-strong vortex pinning contribution appearing in these nanocomposites, induced by local lattice distortions. As a consequence, we demonstrate that the addition of non-coherent NPs produces a decrease in the creep rate S in most of the phase diagram, particularly, in the range of fields and temperatures ( , ) relevant for large scale applications.
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Rouco et al. (2014) studied this question.
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