  The effects of hole content (p) and oxygen deficiency (delta) on the
zero-field critical current density, Jc0, were investigated for high-quality
c-axis oriented Y1-xCaxBa2Cu3O7-delta (x = 0, 0.05, 0.10, and 0.20) thin films.
Ca was used to introduce hole carriers in the CuO2 planes, independent of the
oxygen deficiency in the CuO1-delta chains. Low-temperature Jc0(16K) of these
films above the optimum doping were found to be high (> 10^7 Amp/cm^2) and were
primarily determined by the hole concentration, reaching a maximum at p ~
0.185+/-0.005, irrespective of oxygen deficiency. This implies that oxygen
disorder plays only a secondary role and the intrinsic Jc0 is mainly governed
by the carrier concentration and consequently by the superconducting
condensation energy which also peaks at p ~ 0.19 where the pseudogap
correlation vanishes.
