Bi-Pb-Sr-Ca-Cu-O系超伝導薄膜の臨界電流密度に影響をおよぼす諸因子

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The Bi-Pb-Sr-Ca-Cu-O thin films with different (Bi+Pb) content were prepared on non-heated MgO single crystal (100) by rf magnetron sputtering using multi targets ; Bi0.5Pb0.5Ox, CaCu0.75Ox, SrCu0.75Ox. The obtained amorphous films were annealed to crystallize. Most of the samples which were annealed at 832-836°C for 65 hours showed high Tc(Tc>100k). Jc of these films was very sensitive to annealing temperature and varied from nearly 0 to 1187 A/cm2 (at 77K and in zero magnetic field). The change of Jc for annealing temperature depended on the film composition. The more grains in the films grew coarsely, the more Jc was decreased. We suggested that the low Jc of the films withcoarsemorphology was caused by small superconducting current path area
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