▎ 摘　　要

Magneto transport and magnetization are studied in graphene oxide (GO)-doped YBa2Cu3O7-delta ( YBCO) high-temperature superconductor. The samples were prepared by sol-gel method with different weight percentage (0, 0.3, 0.5 wt.%) of GO. The transition temperature of GO-doped samples did not change in comparison with the pure YBCO. However, SEM images show that the GO doping reduces the grain average diameter, which results in an enhancement (up to a factor of similar to 2) of the critical current density and of the flux pinning force in the presence of different applied magnetic fields.