Synthesis and superconductivity in (Pb,Ti)Sr2(Ca1-xRx)Cu2O z (R = Pr and Tb) systems

초록

The (Pb,Ti)-based 1212 compounds (Pb0.5Ti0.5)Sr-2(Ca1-xRx)Cu2Ox (R = Pr and Tb) are synthesized to study the effect of Pr and Tb substitution on superconductivity. It is found that for R = Pr, the 1212-phase formation region exists for 0.35-1.0, while for R = Tb, the 1212-phase is obtained in the narrow range of 0.3-0.5. Superconductivity is observed for phases with x = 0.35-0.55 for R = Pr and x = 0.3-0.50 for R = Tb. Maximum T-c of 45 and 54 K are observed for R = Pr and Tb, respectively. (C) 2000 Elsevier Science B.V. All rights reserved.

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