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Void distributions and critical current densities in fluorine-doped YBa2Cu3Ox superconductors

The critical current density in superconductors is determined by the pinning strength. One of the wellknown effective pinning centers in oxide superconductors is the void, so observations of the microstructure and comparisons of experimental and theoretical critical current densities in fluorine-doped and non-doped Y 1 Ba 2 Cu 3 O x superconductors are performed. The voids are dispersed uniformly in the fluorine-doped superconductors. However, in non-doped superconductors there were few in comparison with doped superconductors. In addition, the voids are dispersed finely as the electric furnace cooling rates decrease.