Doping dependence on the de-pinning current in Bi2212

The effect of oxygen doping on the critical de-pinning current density, Jc, was

measured in a series of high quality c-axis oriented Bi2212 thin films. For

each doping level, we measured the temperature dependence of Jc. We find that

all samples have the same temperature dependence but the critical current at

zero temperature, Jc(0), has a non-trivial doping dependence with a maximum at

a unique doping level in the overdoped side of the superconducting dome.