The influence of 0.00, 0.20, 0.40, 0.50, and 0.60 wt% nano-sized tin oxide (SnO₂) particles on electrical conductivity fluctuation in normal and superconducting state of the Y₃Ba₅Cu₈O_18±delta (denoted as Y-358) polycrystalline samples is studied. Phase formation and microstructures have been systematically examined. By increasing the content of SnO₂ in YBCO matrix, X-ray diffraction technique showed slight variation in lattice parameters and overall reduction in the orthorhombicity. Scanning electron microscopy observations and the crystallite size calculation also revealed that the grain size and the average crystallite size decreased compared to the SnO₂-free sample. Aslamazov-Larkin and Lawrence-Doniach prototypes were used to analyze conductivity fluctuations based on the electrical resistivity rho(T) measurements. Superconducting transition temperatures T_c and T_LD have been reported. The influence of SnO₂ addition on the superconducting properties indicates that with the addition of SnO₂ nanoparticles into Y-358 compound, some parameters values such as zero-resistance critical temperature T_{c zero}, coherence distance alongside the c axis at 0 K ξ_c(0), and super-layer length d decrease in total, while anisotropy γ, critical magnetic fields B_c1(0), B_c2(0), and critical current density J_c(0) increase in SnO₂-added Y-358 specimens compared to the pure one. The reasons corresponding to these scenarios are discussed in details. Keywords: phase formation, conductivity fluctuation, SnO₂ nanoparticle, Y-358.

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Дата начала обработки статистических данных - 27 января 2016 г.