Superconducting Properties and Surface Resistance of YBCO Strip Lines with Ag₂O and Ag Addition

Abstract

Superconducting properties and surface resistance, R_s, of YBa₂Cu₃O_7-y strip lines prepared by the screen printing were investigated. The T_c of these strip lines with and without Ag₂O and Ag additions was almost the same. However, J_c values increased with increasing the addition of Ag and Ag₂O. The R_s values of these strip lines in superconducting state decreased with increasing the addition of Ag and Ag₂O, and the optimum addition was about 10-15wt.%. The lowest values of R_s were about 15mΩ at 60K. The R_s values were proportional to frequency f¹, in contradiction to f² dependence expected from the two-fluid model.