Influence of hydrogenation on inter- and intragranular critical currents in YBa2Cu3O7-delta

Ac permeability measurements help examine the effects of hydrogenation on the inter- and intragranular critical current density in YBa2Cu3O(7-delta). Hydrogenation increases intragranular current density that is related to elevated pinning inside the grains. Decrease in intergranular critical current density on hydrogenation is due to the attenuation of Josephson junctions between the grains.