We report here the effect of melting time (t_m = 2.5–4.5 min) on the conductivity and dimensionality of BSCCO cooper oxide system. It is found that the mean field and crossover temperatures (T_c^mf, T₀₁, and T₀₂) are increased by increasing t_m up to 3.5 min, followed by a decrease with further increase of t_m up to 4.5 min. The logarithmic plots of excess conductivity (∆σ) and reduced temperature (Є) reveal three regions of different exponents corresponding to two crossover temperatures in the slope of each plot. Interestingly, the crossover occurs from three dimensional (3D) to zero dimensional (0D/SW) in the mean field region and from 0D/SW to two dimensional (2D) in the critical field region, for the samples melted at t_m = 2.5, 4, and 4.5 min, while it occurs from (3D) to one dimensional (1D) and from (1D) to (2D) for the sample melted at t_m = 3.5 min. On the other hand, we have estimated several physical parameters such as order parameter exponents (λ), interlayer coupling (K), c-axis coherence length (ξ_c (0)), anisotropy (γ), Ginsburg number (G_i), critical magnetic fields (H_c(0), H_c1(0), and H_c2(0)), and critical current (J_c (0)) for all samples. It is found that λ₁, λ₃, K, ξ_c (0), G_i, and γ are increased by increasing t_m up to 3.5 min, followed by a decrease with further increase of t_m up to 4.5 min as well as T_c, T_c^mf, and T₀ behaviors. But the vice is versa for the behaviors of λ₂, κ, H_c(0), H_c1(0), H_c2(0), J_c(0), and N_G. Moreover, it is observed that the behavior of critical fields and critical current against melting time is controlled by the order parameter exponent of the second region rather than the first and third regions. These results are discussed in terms of the correlation between the effects of melting time on the weak links and the flow of actual supercurrent in the considered system.

我们在这里报告了熔化时间（t _m = 2.5–4.5分钟）对BSCCO氧化铜体系的电导率和尺寸的影响。发现通过将t _m增大到3.5 min，平均场和交叉温度（T _c ^mf，T ₀₁和T ₀₂）增大，然后随着t _m的进一步增大而减小。长达4.5分钟 过剩电导率（∆σ）和降低的温度（Є）的对数图显示了三个不同指数区域，分别对应于每个图的斜率中的两个交叉温度。有趣的是，对于在t _m = 2.5时熔化的样品，在平均场区域中发生从三维（3D）到零维（0D / SW）的交叉，在临界场区域中发生从0D / SW到二维（2D）的交叉。，4和4.5分钟，而在t _m = 3.5分钟时熔化的样品从（3D）到一维（1D），从（1D）到（2D）。在另一方面，我们已估计的几个物理参数如顺序参数指数（λ），层间耦合（ķ），c轴相干长度（ξ _Ç（0）），各向异性（γ），金斯堡数（G _i），临界磁场（H _c（0），H _c1（0）和H _c2（0））和临界电流（J _c（0） ）用于所有样本。据发现，λ ₁，λ ₃，ķ，ξ _Ç（0），G ^_我，和γ通过增加吨_中号高达3.5分钟，通过与进一步增加的吨的降低，接着_中号高达4.5分钟以及为T _c，T _c ^mf和T ₀行为。但副是反之亦然为λ的行为₂，κ，ħ _Ç（0），H ^ _C1（0），H ^ _C2（0），Ĵ _Ç（0），和Ñ _ģ。而且，观察到，临界场和临界电流对熔化时间的行为是由第二区域而不是第一和第三区域的有序参数指数控制的。将根据熔断时间对薄弱环节的影响与所考虑系统中实际超电流之间的相关性来讨论这些结果。