Excess Conductivity Analysis of Pb Substituted

Tl-1212 (Tl1-xPbx)Sr2CaCu2O7-δ (x = 0.1 0.7)

Prepared Using Nanosized PbO


Hanan Saleh Elmasroub and R. Abd-Shukor


School of Applied Physics, Universiti Kebangsaan Malaysia

43600, Bangi, Selangor, Malaysia


Corresponding author: ras@ukm.my




The effect of Pb substitution on Tl-1212 high temperature superconductors with nominal composition (Tl1-xPbx)Sr2CaCu2O7-δ (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 and 0.7) has been investigated. The samples were synthesized using the solid state reaction technique. Nano sized PbO (10 nm) was used as the starting materials for Pb. The samples were studied by powder X-ray diffraction method, electrical resistance measurements and scanning electron micrography. The resistance-temperature curves showed metallic behavior for all samples. Sample with x = 0.6 showed the highest Tc onset (88 K) and Tc zero (77 K). The X-ray diffraction patterns showed a single Tl-1212 phase with few weak diffraction lines of Tl-1201. The deviation of electrical resistivity from linear behavior increased with decrease in temperature due to the excess conductivity associated with Cooper pair formation. Sample with x = 0.6 has highest value of ξc(0) = 1.3 which indicate lowest degree of anisotropy of Tl1212 samples.


Keywords: Superconductor; Tl-1212 phase, Pb; electrical properties






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