Вышедшие номера
Phase Formation and Conductivity Fluctuation Investigation in Nanoparticle SnO2-Added Y3Ba5Cu8O18±delta Polycrystalline Superconductor
Ghaedsharafi N.1, Shams G.1, Soltani Z.1
1Department of Physics, Shiraz Branch, Islamic Azad University, Shiraz, Iran
Email: shams@iaushiraz.ac.ir
Поступила в редакцию: 23 мая 2020 г.
Выставление онлайн: 3 августа 2020 г.

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 Y3Ba5Cu8O18±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 Tc and TLD 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 Tc zero, coherence distance alongside the c axis at 0 K ξc(0), and super-layer length d decrease in total, while anisotropy γ, critical magnetic fields Bc1(0), Bc2(0), and critical current density Jc(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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