Abstract
The magnetization as a function of external applied magnetic field M(${\mathit{H}}_{\mathrm{ext}}$) of polycrystalline ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ (poly-YBCO) exhibits behavior that is more consistent with the geometrical barrier model of Zeldov et al. than that of either the Bean-Livingston surface-barrier model or the Bean critical state strong-pinning model. Correlation of the magnetization measurements with transport measurements suggests that the irreversible properties of poly-YBCO, including the critical current density ${\mathit{J}}_{\mathit{c}}$, are dominated by surface-barrier effects. Observation of an increasing of ${\mathit{J}}_{\mathit{c}}$ with ${\mathit{H}}_{\mathrm{ext}}$ at intermediate fields is consistent with a theoretical model that describes the transport behavior in the case of vortex lattice formation within the superconducting grains that form the Josephson junctions.
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