Effects of oxygen content on the pinning energy and critical current in the granular (Hg, Re)-1223 superconductors

Hg0.82Re0.18Ba2Ca2Cu3O8+d polycrystalline samples, with different oxygen content, were investigated by ac resistance measurements under different applied magnetic field (up to <32 × 103 A/m) and critical current measurements. The intergrain and intragrain regions have shown an improvement in the pinning energy and critical current density, as considering the precursor preparation with 10% of O2 and 90% of Ar (optimal doped). In addition, the samples presented S-I-S junctions type as considering Ambegaokar-Baratoff theory.