Abstract
To study flux pinning modulation due to intentional adjustments of rare earth cations, layer sequences and island-like secondary phases, we built up a series of artificial multilayers consisting of binary rare earth R123 as well as quasi-multilayers consisting of Y123/M (M = oxides such as Yttria Stabilized Zirconia) on single crystalline SrTiO3 by pulsed laser deposition. The field dependence of transport critical current density Jc was measured at various temperatures and directions of the applied magnetic field. Comparing with pure Y123 films, almost all present multilayers and quasi-multilayers showed a crossover behaviour of flux pinning, evidenced by an existing medium field (Hcro) below which Jc is lower than of pure Y123 films, whereas above Jc is higher. Furthermore, a strong temperature dependence of such a crossover field was observed. The higher the temperature, the higer Hcro, implying that an artificial tailoring of flux pinning may appear in a narrow range of fields as the mixed vortex state moves towards to the region of weak vortex glass and vortex liquid. However, the improvement of flux pinning is hardly observed in the state of strong vortex glass.
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