Magnetic field dependence of critical current density in Pt-doped thick films

The addition of platinum and the (0412) phase to melt-textured (YBCO) thick films has been shown to induce notable improvements in the flux pinning characteristics of the material. Transport critical current density values in excess of at 77 K and self-field have been achieved, with volume magnetization values in excess of at 77 K and zero applied field. Measurements of both the inter- and the intra-granular flux pinning characteristics in applied fields indicate that this behaviour is greatly improved in the Pt-doped YBCO films. The enhanced flux pinning was attributed to an increase in defect densities within the matrix material, associated with a change in the morphology of inclusions.

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