Effect of the AgO2 doping on the superconducting material of YAgxBa2Cu3O7-δ, Y3AgxBa5Cu8O18- δ and Y7AgxBa11Cu18O40-δ

Abstract

The Y123, Y358, and Y7-11-18, and AgO2 composite was predominantly synthesized through a solid-state reaction. As the Ag content increased, both the critical temperature and the superconducting compound exhibited enhancement. The non-superconducting compound segregated into two distinct groups: BaCuO2 (Im-3m) and Ba2Cu3O6 (Pccm). While Ag doping did not impact the c lattice parameter value, it did alter the a and b lattice parameters in Y358 and Y7-11-18. Y123 demonstrated the most stable anisotropic parameters. Additionally, Ag doping did not influence the increase in oxygen content. Among the samples, Y123 exhibited the highest Cu3+/Cu2+ ratio, while Y7-11-18 displayed the most deficient parameters, contributing to a higher critical temperature. The heat reaction for all samples indicated an endothermic reaction, resulting in a decrease in the samples' melting point. Furthermore, compared to undoped samples, Ag doping enhanced the surface homogeneity.