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Structural characterization and superconductivity in Bi1.7Pb0.3-xTbxSr2Ca3Cu4Oy. The influence of Tb-doping

Bi 1.7 Pb 0.3-x Tb x Sr 2 Ca 3 Cu 4 O y compounds (0.0≤x≤0.1) are synthesized by using the conventional high temperature melt quenching technique to study the influence of Tb substitution on their high-T c superconducting properties. The effects of different Tb doping levels on the superconductor structure have been investigated by electrical resistance, magneto-resistance, scanning electron micrographs, and XRD measurements. It has been observed that, with increasing Tb 3+ substitution for Pb 2+ the high-T c Bi-(2223) phase gradually transforms into the low-T c Bi-(2212) and Bi-(2201) phases. It should be pointed out that the low-T c superconducting phases of Bi-(2212) and Bi-(2201) are formed for all the doping levels. The data suggest that with the increasing Tb doping level the superconductivity in Bi 1.7 Pb 0.3-x Tb x Sr 2 Ca 3 Cu 4 O y system is suppressed due to the destruction of the phase coherence by pair-breaking effects, such as magnetic. The magneto-resistance results clearly demonstrate that with increasing magnetic field first the high-T c Bi-(2223) phase gradually diminishes and almost the low-T c Bi-(2212) phase remains, however, the trends indicate that at a reasonably high magnetic field the low-T c phase will also be destroyed and hence the superconductivity will not be observed any more, as expected.