Magnetism and superconductivity are mutually exclusive phenomena and their interaction is an interesting topic to study. In this work the effect of Co0.5Zn0.5Fe2O4 (CZFO) nanoparticle with size 20- 50 nm on YBa2Cu3O7-(YBCO) is reported. The samples were prepared using solid state reaction with starting composition YBa2Cu3O7-(Co0.5Zn0.5Fe2O4)x with x = 0 to 0.4 weight percent ...