Abstract
Superconducting YBa2Cu3Ox films on MgO(100) substrates were prepared by pulsed laser ablation with pulsed laser irradiation on the growing film surface. The irradiation effects on the crystal structure were studied for various substrate temperatures and irradiation fluences. These experiments revealed that a poorly crystallized film was successfully converted to a well-crystallized film with a-axis orientation after irradiation at a low substrate temperature. At a high substrate temperature, the a-axis-oriented crystallites were introduced into c-axis-oriented films upon irradiation, without degradation of the crystallinity, suggesting the possibility that these crystallites play the role of pinning centers in high-T c superconducting films.
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