Effect of granularity and inhomogeneity in excess conductivity of YBa2Cu3O7−δ+xBaTiO3 superconductor

Effect of long aging on the resistivity properties of optimally doped YBa2Cu3O7−δ single crystals

“…It is important for the analysis of the experimental data to have a precise determination of the Т с [22,23]. In our case T c is defined by the maximum on dρ ab (T)/dT dependencies in the superconducting transition region ( Fig.…”

The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

“…This may be due to the sticking of nanosized CoFe 2 O 4 on the surface of the grains, leading to increase in grain connectivity and filling up of cracks and voids. Mohanta et al [24] Table 1. It is clear that the grain size shows a decrement behavior from 1.52 to 0.98 μm as x increases from 0 to 0.1, which suggests that nanosized CoFe 2 O 4 acts as a well growth inhibitor which limits the grain size [25].…”

Magneto-transport studies in (1-X) YBa2Cu3O7−+X BaTiO3 superconductors

“…Stiochiometric amount of high-purity powders of Y 2 O 3 , BaCO 3 and CuO precursors were grinded and calcined at 870°C. BTO precursor powder was synthesized through chemical route method calcined at 1250°C for 2 h. Zeta particle analyser revealed that the average particles size of BTO calcined powder ranged between 100-400 nm [21]. A series of polycrystalline composite samples of (1 À x) YBCOþx BTO (x ¼0.0, 1.0, 2.5, 5.0 and 10.0 wt%) were then pressed into pellets for final sintering at 920°C for 12 h. The process was followed by oxygen annealing at 500°C for 12 h to obtain well oxygenated densely packed samples.…”