Superconducting parameter determination for (Co 0.5 Zn 0.5 Fe 2 O 4 ) x /Cu 0.5 Tl 0.5 ‐1223 composite /M. ME. BARAKAT a,* , N. AL-SAYYED b , R. AWAD b , A. I. ABOU-AL - BARAKAT,M. ME.