Abstract
In the Tl-based compound TlSr2CaCu2O7 (Tl-1212), single substitution (Pb or rare-earth element) only achieves a Tc of 80–90 K, and double substitutions (Pb and rare-earth element) have been considered necessary to enhance the Tc of the Tl-1212 phase to above 100 K. In this work, we found that superconductivity above 100 K could be achieved in both of (Tl1-xBix)Sr2(Ca0.8Pr0.2)Cu2Oz and (Tl1-x-yPbxBiy)Sr2CaCu2Oz systems, in addition to the well-known (Tl0.5Pb0.5)Sr2(Ca0.8Pr0.2)Cu2Oz compound. These results indicate that either the substitution of the rare-earth element or such double substitutions are not essential for enhancing the Tc to above 100 K in the Tl-1212 phase.
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