We report here measurements of the excess conductivity, the diamagnetic transition and the FTIR spectra of Bi 1.7 Pb 0.30 Sr 2 Ca 1− x La x Cu 2 O y superconductor with various x values (0.00 ≤ x ≤ 0.30). It is found that the magnetic moment is negative below the diamagnetic transition in both field cooling (FC) and zero-field cooling (ZFC) for all samples. Furthermore, the magnetic moment is gradually shifted to lower values close to zero as the La concentration increases up to 0.30, but their values for FC are higher than that of ZFC. Moreover, the onset of diamagnetism ( T cM ) for the La = 0.30 sample is 80 K, which is about 29 K higher than that obtained from resistivity ( T cR = 51 K). On the other hand, the logarithmic plots of excess conductivity ∆ σ and reduced temperature Є reveal three different exponents corresponding to two crossover temperatures in the slope of each plot for all samples. The first exponent occurs in the normal field region (NFR) and its values are 0.90 (2D), 0.67 (2D), 0.23 (3D) and 0.77 (2D). The second exponent occurs in the mean field region (MFR) and its values are 0.51(3D), 0.23 (3D), 1.05 (2D) and 0.17 (3D). The third exponent occurs in the critical field region (CFR) and its values are 0.90 (2D), 0.78 (2D), 0.70 (2D) and 0.35 (3D). Interestingly, The Ginzburg-Landau parameter, critical magnetic fields and critical current density are gradually increased with La concentration up to 0.30, while the interlayer coupling, coherence lengths, anisotropy and Ginzburg number are decreased. Finally, the FTIR absorption spectra of the samples show nine successive peaks due to O–H, Bi(Pb):2223, residual carbon, SrCO, CaCO 3 and CuO, and M–O, respectively. These results are discussed in terms of the correlation between hole carriers/Cu ions and excess oxygen which are introduced by La through CuO 2 planes of BSCCO superconductors.

中文翻译：

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在 (Bi,Pb):2212 超导系统中被 La 取代的 Ca 的过度电导率、抗磁转变和 FTIR 光谱

我们在此报告了对具有不同 x 值 (0.00 ≤ x ≤ 0.30) 的 Bi 1.7 Pb 0.30 Sr 2 Ca 1− x La x Cu 2 O y 超导体的过度电导率、抗磁性转变和 FTIR 光谱的测量。发现对于所有样品，在场冷却 (FC) 和零场冷却 (ZFC) 中，磁矩在抗磁转变以下均为负值。此外，随着 La 浓度增加到 0.30，磁矩逐渐移动到接近零的较低值，但它们的 FC 值高于 ZFC 的值。此外，La = 0.30 样品的抗磁性起始值 ( T cM ) 为 80 K，比电阻率 (T cR = 51 K) 高出约 29 K。另一方面，过量电导率 Δ σ 和降低的温度 Є 的对数图显示了三个不同的指数，对应于所有样品的每个图的斜率中的两个交叉温度。第一个指数出现在正常场区 (NFR) 中，其值为 0.90 (2D)、0.67 (2D)、0.23 (3D) 和 0.77 (2D)。第二个指数出现在平均场区 (MFR) 中，其值为 0.51(3D)、0.23 (3D)、1.05 (2D) 和 0.17 (3D)。第三个指数出现在临界场区 (CFR) 中，其值为 0.90 (2D)、0.78 (2D)、0.70 (2D) 和 0.35 (3D)。有趣的是，随着 La 浓度达到 0.30，Ginzburg-Landau 参数、临界磁场和临界电流密度逐渐增加，而层间耦合、相干长度、各向异性和 Ginzburg 数降低。最后，由于 O-H、Bi(Pb):2223、残留碳、SrCO、CaCO 3 和 CuO 以及 M-O，样品的 FTIR 吸收光谱显示了 9 个连续的峰。这些结果是根据空穴载流子/Cu 离子与由 La 通过 BSCCO 超导体的 CuO 2 平面引入的过量氧之间的相关性来讨论的。