Infield response of (Al2O3)x/CuTl-1223 nanoparticles-superconductor composites

We have investingated the effects of Al2O3 nanoparticles addition on infield superconducting transport properties of (Cu0.5Tl0.5)Ba2Ca2Cu3O10–δ (CuTl-1223) matrix. The addition of Al2O3 nanoparticles has not affected the crystal structure of host CuTl-1223 phase, which has confirmed the occupancy of these nanoparticles across the inter-granular spaces. A significant resistive transition broadening was observed with externally applied magnetic field from 0–7 T. The enhancement of transition broadening was attributed to vortex–antivortex pair-breaking by applied magnetic field and temperature due to increase of dissipation process. Dissipative behavior of resistivity and activation energy {Uo(H,T)} was explained by thermally activated flux flow (TAFF) model. Suppression of Uo(H,T) showed the reduction of flux pinning strength with increasing content of Al2O3 nanoparticles.