ARS'I'RACT:Shielding laclor of a BSCCO 22 12 phase HTc superconducting cylinder had a maxiinurn or 10~" .evcn though the cylinder had a large length/diameter ratio enough to be expected that shielding factor exceeded IO'. In this paper two models are proposed to discuss the leakage of the magnetic field in the superconducting cylinder under experimental results of the shielding properties.

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YBa$h,O,, thin films were grown on vicinally polished MgO(001) substrates using a reactive rf-magnetron sputtering technique. We studied effects of vicinal cut on growth orientations and transport properties. The c-axis directions of all the films were strongly influenced by the substrate surface normal, with weak alignment to the substrate [OOlIMgO direction. No significant dependence of Tc's on vicinal angles was abserved. However, Jc's were strongly degraded with vici-YBCO films to increase a density of weak links.