Infield response of (Co)x/CuTl-1223 nanoparticles-superconductor composites

Infield superconducting properties of (Cu0.5Tl0.5)Ba2Ca2Cu3O10−δ (CuTl-1223) superconducting phase after addition of cobalt (Co) nanoparticles were reported. Crystal structure of host CuTl-1223 phase was not affected after inclusion of Co nanoparticles. Superconducting resistive transition broadening was observed with applied magnetic field from 0 to 7 T, which was attributed to dissipation mechanism caused by thermally activated flux flow (TAFF) in the presence of small current (10 μA). Reduction in activation energy Uo(H, T) showed suppression of flux pinning strength with increasing content of Co nanoparticles.