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The preparation and electrical properties of Bi2Sr2CaCu2Oy thick films with high Tc on (100) MgO substrate

X L Wang, P L Steger, A Ritzer, B Hellebrand, S Proyer, E Stangl and X Z Wang

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Thick c-oriented films, of single-phase Bi2Sr2CaCu2Oy (Bi-2212) were prepared on (100) MgO substrates by employing a partial melting method. The effect of quenching on Tc0 was studied. The highest Tc0 obtained by resistance measurement was 92 K, whereas 93.2 K was achieved by AC susceptibility measurements. The best results for the critical current density Jc, measured in zero magnetic field, were 1.3*103 A cm-2 at 77 K and 7*103 A cm-2 at 53 K. Near Tc the temperature dependence of Jc can be described by Jc approximately (1-T/Tc)2. At temperatures Tc<<Tc the dependence of Jc on temperature can be described by a homogeneous superconductor flux creep model.


PACS

74.25.Sv Critical currents

74.25.Qt Vortex lattices, flux pinning, flux creep

74.72.Hs Bi-based cuprates

74.78.Bz High-Tc films

Subjects

Superconductivity

Dates

Issue 4 (April 1995)



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