Abstract
Nickel ferrite (NiFe2O4) nanoparticles were added in to (Cu0.5Tl0.5)Ba2Ca2Cu3O10−δ (CuTl-1223) superconducting matrix to get (NiFe2O4)x/CuTl-1223 composites with x=0, 0.25, 0.50, and 1wt%. The inverse spinel (cubic) structure of NiFe2O4 nanoparticles and tetragonal structure of CuTl-1223 superconducting matrix were confirmed by using x-ray diffraction (XRD). There were no significant variations observed in the lattice parameters of the tetragonal structure of CuTl-1223 superconducting matrix with increasing nanoparticle concentration. The zero resistivity critical temperature (Tc) was decreased, while normal state resistivity (ρ300K) was increased with increasing nanoparticle concentration, which is most probably due to Cooper pair-breaking and localization of mobile free carriers across these magnetic nanoparticles. The suppression of activation energy (U) was also observed with increasing nanoparticle concentration, which is attributed due to inhomogeneous distribution and agglomeration of these magnetic nanoparticles. The microscopic superconductivity parameters as deduced from fluctuation induced conductivity (FIC) analysis of (NiFe2O4)x/CuTl-1223 composites are found to be in accordance with the experimental findings.
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