Temperature driven shifts of super-conductance in Zn-doped CuTl-1223 nanoparticle

Abstract

Zinc (Zn) nanoparticles (NPs) were synthesized using colloidal solution method and superconducting (Cu_0.5Tl_0.5)Ba₂Ca₂Cu₂O_10-δ phase was ready via conventional solid state reaction method. The desired (Zn)_x/CuTl-1223 product with x = 0 ~ 4.0 wt. % was obtained by adding Zn NPs in superconducting CuTl-1223 matrix. The frequency and temperature dependent properties of (Zn)_x/CuTl-1223 composites were explored via complex electric modulus measurements. The complex electric modulus (CEM) measurements were carried out to determine the capacitive contribution in ac-conduction mechanism for the synthesized composites. Comparatively, the capacitance linked with grain-boundaries was found greater than the capacitance of grain. The capacitive contribution among grain-boundaries was reduced while that of the grains was increased with increasing temperature for all these composites materials. The shifting of peaks in imaginary part of the electric modulus (M^//) versus frequency (f) spectra towards smaller frequency regime by increasing concentration of Zn NPs in superconducting CuTl-1223 phase was witnessed for the existence of non-Debye relaxation in the material. The results, notably the changes in grain-boundary capacitance and the presence of non-Debye relaxation, have potential applications in optimizing battery systems, improving superconducting materials for AC conduction, and designing sophisticated electronic devices involving frequency-dependent dielectric traits.