Abstract
(Tl1−xPbx)(Sr2−yBay)Ca3Cu4Oz samples were synthesized by using a two-step solid state reaction method and examined with respect to the (Tl,Pb)-1234 phase formation and superconducting properties. Samples were prepared from various starting compositions of 0≤x≤0.5 and 0.4≤y≤2.0. Nearly single-phased samples were obtained for (Tl0.8Pb0.2)(Sr2−yBay)Ca3Cu4Oz (1.0≤y≤1.25) and (Tl1−xPbx)(SrBa)Ca3Cu4Oz (0.15≤y≤0.35). We have found that both the partial substitution of Ba for Sr and the partial substitution of Pb for Tl are effective for the formation of the Tl-1234 phase. Bulk superconductivity with a Tc value of 106 K is observed in the (Tl0.7Pb0.3)(SrBa)Ca3Cu4Oz sample.
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