Study on Bi2Sr2CaCu2O8/CoFe2O4 composites

Abstract

Composites of Bi-2212 with Cobalt ferrite (CoFe2O4) have been prepared to study different properties like critical current density, transition temperature and surface morphology. Bulk Bi2Sr2CaCu2o8 (Bi-2212) superconductors are prepared by solid state route. Cobalt ferrite (CoFe2O4) samples are prepared via sol-gel method. The phases of both Bi-2212 and cobalt ferrite are studied by x-ray diffraction, which are found to be in match with JCPDS data. When the various concentrations of cobalt ferrite is added to Bi-2212, the transition temperature of Bi-2212 decreases drastically. Addition of higher concentration makes the sample semiconducting till the lowest temperature of investigation. The critical current density of Bi-2212 is measured below the transition temperature. It is observed that the critical current density of Bi-2212 decreases with increasing temperature.