ANISOTROPY OF THE ION-BEAM RADIATION EFFECT IN YBA2CU3O7-DELTA (110) THIN-FILMS

The anisotropy of the radiation effect on normal-state resistivity has been studied on YBa2Cu3O7-delta (110) thin films irradiated by 200-keV proton beams. The resistivity along the Cu-O planes increases with the ion dose while the out-of-plane resistivity decreases and becomes metal-like at a very low dose, where the superconducting transition temperature and the in-plane resistivity show little change. This suggests that the c-axis transport properties are sensitive to the structural defects and there exist no direct correlations between the unusual c-axis transport behavior and the superconductivity mechanism in YBa2Cu3O7-delta (110) thin films.