Abstract
Bi1.8Sr2AuxCa1.1Cu2.1Oy (Bi-2212) polycrystalline ceramics with x = 0.25, 0.3 and 0.35 have been prepared by the solid-state reaction method. XRD results showed the Bi-2212 phase as the major one in all samples, accompanied by metallic Au, and some secondary phases such as Bi2CaO4. Tc values are very similar for all samples, indicating that the carrier concentration is independent of the amount of Au. Magnetic properties of samples, determined through magnetic hysteresis measurements (M–H) performed at both T = 2 and 10 K, showed that samples maintain their diamagnetic characteristics in all cases. In addition, Jc values, calculated from their magnetic hysteresis loops using the Bean’s model, showed that addition of metallic Au in high contents leads to an important increase when compared to the samples with low Au content.
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