Dielectric properties of (Zn) x /CuTl‐1223 nanoparticle–superconductor composites /M. MUMTAZ a,* , Liaqat ALI a , Shoaib AZEEM a , Saad ULLAH a , G. HUSSAIN a , M. W. RABBANI a , Abdul JABBAR b , K. NADEEM a - MUMTAZ,M.