Fluctuation Magneto-Conductivity in La–Ba–Ca–Cu–O Superconductors

Temperature variation of magneto-resistivity measurements have been carried out at 1 T magnetic field on (La_1.5Gd_0.5)Ba₂CaCu₅O _z and, on pure and 5 wt.% Ag doped (La_1.6Y_0.4)Ba₂Ca_0.8Cu_4.8O _z superconductors. These data were analyzed in terms of fluctuation magneto-conductivity by using Aslamazov—Larkin and Maki—Thompson models for layered superconductors. These materials exhibit strong pair breaking effect and the typical phase breaking time at 100 K is found to be in the order of 10^?16 s. The typical values of coherence lengths along ab plane and along c-direction at 0 K are found to be 16.6 and 0.5 Å.