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Fluctuation induced conductivity (FIC) analysis on dc resistivity versus temperature data of as-prepared and oxygen post-annealed TlBa2(Ca2-yMgy)Cu3O10-δ (y = 0, 0.25, 0.5, 0.75, 1.0) superconductor samples are carried out by using Aslamazov–Larkin model for excess conductivity. The microscopic parameters such as zero temperature coherence length along c axis {ξc(0)}, interlayer coupling (J), intergrain coupling (α), critical exponent (λ) and dimensionality of superconducting fluctuations are calculated with the help of aforementioned model. The crossover temperature (To) is shifted towards higher temperature values with the increase of Mg contents up to y = 0.5 and then start to decrease but still remains greater than those values of undoped samples. The increase in ξc(0) and J after Mg-doping at Ca sites shows the improvement of interplane coupling in TlBa2(Ca2-yMgy)Cu3O10-δ samples. The appreciable change in all the microscopic parameters extracted from the FIC analysis indicates the optimization of ox...

Excess conductivity analysis and infrared absorption spectroscopy of Mg-doped TlBa2Ca2Cu3O10-δ superconductor