Critical current density and microstructure of c-axis-oriented Bi2Sr2CaCu2Oχ and (Bi, Pb)2Sr2Ca2Cu3Oχ superconducting tapes
作者： A. Oota , M. Funakura , J. Iwaya , H. Matsui , K. Mitsuyama
DOI: 10.1016/0921-4534(93)90481-5
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摘要: Abstract The critical current density J c is investigated as a function of both field direction and temperature in -axis-oriented Bi 2 Sr CaCu O χ “2212” (Bi, Pb) Ca Cu 3 “2223” polycrystals: screen-printed tape with (77 K, 0 T) = 1.4×10 4 A / cm , 1.5×10 Ag-sheathed 2.2×10 . versus θ data at 77 K the angle between B -axis show that influenced only by component parallel to -axis. There correlation anisotropy ratio γ=J ( ⊥ )/J || ) half-height angular width Δθ peak for An increase sample enhances γ narrows Δθ. At fixed has largest narrowest all samples, which corresponds SEM result showing highest alignment. second lowest tape. zero increases almost linearly decreasing below 70 explained flux creep model.
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