Enhancing of magnetic flux pinning in YBa2Cu3O7−x/CuO granular composites

Abstract

Enhancement of flux pinning and critical currents in YBa 2 Cu 3 O 7 − δ films by nanoscale iridium pretreatment of substrate surfacesThis paper shows that the combination of self-assembled structures in the form of "whiskers" and nanoparticles, which appear as a result of the joint sintering powders YBa 2 Cu 3 O 7Àx and arc nanopowders CuO, leads to a significant increase in the current density and the appearance of the peak effect in strong magnetic fields range. Very high critical current density appears from a complex vortex pinning, where the defects in the form of "whiskers" provides more energy of pinning, and nanoparticles inhibit the flux creep. Regulation of the morphology of such structures can be achieved by simple change of the concentration of nanodispersed additives. It is shown that the optimal additive is CuO equal to 20 wt. %. V C 2015 AIP Publishing LLC.

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