Abstract
Superconducting BiPbSrCaCuO thin films with a zero resistivity temperature of 110 K and a critical current density of 2733 A cm −2 (at 77.02 K) were deposited on MgO(100) single crystal substrates by d.c. magnetron sputtering. After deposition at 350–400°C and post annealing at 840°C for 1–5 h in air, with different cooling rates, thin films were obtained which were highly c-axis orientated, with zero resistivity temperatures, T c0, of 103–110 K. The thin film samples with a mixture of high (2223) and low (2212) T c phases show a low T c onset and sharp transition in the resistivity-temperature ( R- T) curves with relatively high current densities. The transport properties of the 100 K sample were studied. The temperature dependence of the critical current density exhibits weak-link characteristics. The mechanism of 2223 phase formation is also discussed.
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