Abstract
Abstract The effects of Y and Pb co-doping on phase evolution, microstructure, electrical and superconducting properties of Bi-2212 have been studied. The results show that Y 3+ ions enter into the crystal structure by replacing Ca 2+ and/or Sr 2+ ions, and hence reduce hole concentration in the electronic structure of the system. Y and Pb co-doping result in the reduction of c-axis resistivity due to strong Josephson coupling between the Cu–O 2 layers at lower Y contents. The T C and J C are significantly enhanced for optimum Y concentration in Pb doped Bi-2212. The variations in the electrical and superconducting properties are due to the structural as well as electronic inhomogeneities and changes in charge carrier concentration due to Pb and Y co-doping.
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