PLD (pulsed laser deposition) prepa

PLD (pulsed laser deposition) prepared YBCO tapes were irradiated by 450MeV Xe 23+ or 500MeV Au 31+ ions with irradiation fluence from 1.0×10 10 to 1.0×10 12 ions/cm 2 to investigate for the effective condition which enhances J c . As a result of ion-irradiation, we observed the enhancement of J c especially at high applied magnetic field in 77K. It was also shown that T c decreased with irradiation fluence. These changes of superconductive properties were found to depend on the kind of the ion and the energy.We also studied post-annealing effect on the irradiated tapes. After the ion-irradiation, the samples were annealed at the temperature of 473K or 673K in the oxygen atmosphere for 2h and then quenched. From the post-annealing experiments, we concluded that the post-annealing was a good way to recover T c without decreasing J c