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The electrical resistivity of polycrystalline Bi2Sr2Ca2Cu3O10-x (Bi-2223) wasmeasured vs. applied magnetic fields up to 0.45 T, applied currents up to 1 A,and temperature from liquid nitrogen temperature (LN2) to room temperature. Inthe lowest temperature region, the only truly zero resistivity was observedwhen the magnetic field was zero; otherwise, a quadratic dependence on themagnetic field occurred. Hysteresis was noted at the higher currents. Currentvs. voltage curves in this region revealed a non-ohmic resistivity. In thetransition region to the mixed state, indications of negative resistivity andsuggestions of a phase change were observed. Arrhenius plots yielded activationenergies of around 0.05 eV/molecule. In the mixed state region up to thetransition temperature of ~110K, analysis implied that 4 superconductingquantum states exist and that they are cooperatively filled by thesuperconducting charge carriers. The occupation of the superconducting quantumstates is negatively affected by the applied magnetic field and by the appliedcurrent. No effect on the polarity or direction of the magnetic field withrespect to the direction of the current was observed.

The Effect of Magnetic Fields, Temperature and Current on the Resistivity of Bi-2223 High Temperature Superconductors