Abstract
Pre-annealing and intermediate rolling (PAIR) process enables one to fabricate Bi 2Sr 2CaCu 2O x (Bi-2212)/Ag tapes with high transport J c>5.0×10 5 A/cm 2 at 4.2 K, 10 T. We study the relationship between thickness of Bi-2212 layer and J c enhancement by PAIR process for monolayer Bi-2212/Ag tapes. J c enhancement by PAIR process is more significant for thinner Bi-2212 layer. For Bi-2212 layer less than 10 μm thick, oxide J c (4.2 K, 10 T) around 4.0 and 1.6×10 5 A/cm 2 are obtained for PAIR and no-PAIR samples, respectively, however, a large variation of J c is seen for both series of samples in this thickness range. Good reproducibility of J c is seen for the samples with the Bi-2212 layer around 20 μm with oxide J c (4.2 K, 10 T) around 3.2×10 5 A/cm 2. PAIR samples show smaller J c variation than no-PAIR samples. J c enhancement by PAIR process diminishes with increasing Bi-2212 layer thickness and disappears at the thickness around 50 μm. PAIR process produces Bi-2212 layer with small variation of thickness (2–8% along the tape length and 2–19% across it), however, large variation of thickness (4–24% along the tape length and 30–80% across it) remains in no-PAIR samples. PAIR process has a large effect to improve the macroscopic homogeneity of Bi-2212 layer. This is supposed to be one of the reasons for the large J c enhancement achieved by PAIR process.
Published Version
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