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Influence of the Tl- and Hg-content on magnetic and transport properties of the Pb, Sr-doped Tl-1223 and Hg-1223 superconductors |
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| Authors: | A Cig J Ma ka M Mair G Gritzner G Plesch V Zrubec |
| Institution: | a Institute of Measurement Science, Slovak Academy of Sciences, Dúbravská cesta 9, 842 19 Bratislava, Slovak Republic b Johannes Kepler Universität Linz, Institut für Chemische Technologie Anorganischer Stoffe, Altenbergerstrasse 69, A-4040 Linz, Austria c Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, 842 15 Bratislava, Slovak Republic |
| Abstract: | The effects of the thallium and mercury content x on the as-sintered and post annealed samples of MxPb0.4Sr1.6Ba0.4Ca2Cu3O8+δ {M: Tl (0.32≤x≤0.74) or Hg (0.18≤x≤0.68)} have been studied by magnetization and transport measurements. For Tl-1223 we have found the optimum Tl doping level to be x=0.53 regarding the grain properties, the content of superconducting phase, the first penetration field Hplwl, the transport (Jctr), magnetic intergrain (JcM) and intragrain (Jcg) critical current densities. The critical temperature Tc of the as-sintered Tl-1223 sample decreased with increasing Tl content. Post-annealing in oxygen improved the Tc for Tl contents of x≥0.53 and had generally positive effects on the critical current densities. The intergrain properties of the Hg-1223 samples were much worse than those of the Tl-based superconductors. |
| Keywords: | Pb Sr-doped Tl-1223 and Hg-1223 superconductors Critical current density Magnetization |
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