Transport properties of heavy-ion irradiated YBa2Cu3Ox thin films

Abstract

We studied the effect of heavy-ion irradiation on the transport properties of YBa2Cu3Ox thin films. The films were grown on LaAlO3 substrate by using laser ablation and were then irradiated by Sn ions with a dose equivalent to a 1-T vortex density. Half of the films was covered during irradiation so that direct comparison could be made. We found that the critical current density at 77 K increased after irradiation from 1.2 x 10(5) to 1.8x 10(5) A/cm(2) in a 2-T field. The irreversibility line also showed a large shift to higher temperatures. The Hall-effect measurement revealed that the scaling behavior between the longotudinal and Hall resistivities, as well as the behavior of the Hall conductivity, had been modified after the heavy-ion irradiation.