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 T_C of Bi-2212 phase monotonically increases with increasing Bi-2223 phase fraction. On the other hand Bi-2223 phase exhibits depression in T_C 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.

中文翻译：

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BSCCO 共存 Bi-2212 和 Bi-2223 相的超导性能的演变

已经在原始和掺铅 BSCCO 中研究了 BSCCO 超导体的超导特性的演变，无意中承载了两个超导相 Bi-2212 和 Bi-2223。Bi-2212相的超导转变温度T _C随着Bi-2223相分数的增加而单调增加。另一方面，Bi-2223 相在T _{C 中}表现出下降其较低的相分数 (<24%) 但随着 Bi-2223 相分数增加到 30%，达到其体积值。通过调用两个共存相之间的邻近效应的相互作用和建立 Bi-2223 超导渗透路径，这种行为已被合理化。除了有助于形成具有更高 Bi-2223 相分数的 BSCCO，Pb 替代还通过创建钉扎中心导致临界电流密度的提高。