Infield superconducting properties of Ni nanoparticles added CuTl-1223 phase

We investigated infield response of nickel (Ni) nanoparticles added Cu0.5Tl0.5Ba2Ca2Cu3O10-δ (CuTl-1223) superconductor. Significant superconducting transition broadening (∆T) was observed under external applied magnetic field. Variation in activation energy Uo(H, T) and flux pinning strength were explored in external applied magnetic field from 0 to 7 T. Infield experimental dc-resistivity data was explained by thermally activated flux flow (TAFF) model. External applied magnetic field gave rise to vortex motion and caused dissipation in (Ni)x-(CuTl-1223) (0≤x≥1.0 wt%) nanoparticles-superconductor composites. Flux pinning strength was reduced with increased Ni nanoparticles content in CuTl-1223 matrix. The systematic increase in ∆T and reduction in Uo (H, T) with increasing magnetic field showed the motion of vortices, which diminished the flux pinning strength.