Abstract
Bulk polycrystalline Tl2Ba2CaCu2Ox materials wereirradiated with 0.8 GeV protons to introduce randomly oriented columnardefects. Proton fluences up to 8.7×1020 m-2 were used to createdefect arrays corresponding to a `matching field' of 1.5 T. Studies wereconducted on the superconductive transition temperature, the Meissnerfraction, the intragrain persistent current density against the magnetic fieldand temperature, and the equilibrium magnetization. The magnetization wasmodelled using London theory with the addition of vortex-defect interactions,yielding physically reasonable parameters.
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