Critical Currents of Tl2Ba2Ca2Cu3Oz Bulk Superconductors
M. Giebułtowski, W. Woch, R. Zalecki, M. Kowalik, J. Niewolski, Ł. Gondek
AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Solid State Physics Department, Cracow, Poland
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The critical temperatures and the critical currents of Tl2Ba2Ca2Cu3Oz (Tl-2223) bulk superconductor have been studied using ac susceptibility measurements before and after the oxygenation process. With oxygenation the critical temperature increased from 114.2 K to 118.8 K and the critical current at 77 K raised from 56 A/cm2 to 230 A/cm2. The Ginzburg-Landau strong coupling limit approach was applied to describe the temperature dependence of the critical current densities.

DOI:10.12693/APhysPolA.135.24
topics: thallium cuprate, oxygenation, critical current