Evolution of Superconducting Properties of Coexistent Bi-2212 and Bi-2223 phases in BSCCO

V, Gayathri ; A. T., Sathyanarayana ; E. P., Amaladass ; K., Vinod ; T., Geetha Kumary ; R., Pandian ; Mani, Awadhesh


The evolution of superconducting properties of BSCCO superconductors, inadvertently hosting the two superconducting phases Bi-2212 and Bi-2223 have been investigated in pristine and Pb doped BSCCO. The superconducting transition temperature TC of Bi-2212 phase monotonically increases with increasing Bi-2223 phase fraction. On the other hand Bi-2223 phase exhibits depression in TC for its lower phase fractions (<24%) but attains its bulk value as Bi-2223 phase fraction is increased to 30%. This behavior has been rationalized by invoking the interplay of proximity effects between the two coexisting phases and establishment of Bi-2223 superconducting percolation path. In addition to aiding the formation of BSCCO with higher Bi-2223 phase fraction, the Pb substitution also leads to an enhancement of critical current density by the creation of pinning centres.


BSCCO; High temperature superconductivity; Proximity effect; Critical current density


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