Abstract

The droplets density of the YBa 2Cu 3O 7-x thin film was increased considerably at a certain laser shot number. Until 100 laser shots of cumulative irradiation, the films have the droplets density of ∼10 3 mm −2 and the YBCO target surface smoothness was maintained. However, after 100 laser shots, the density was increased more than 10 times and the target surface morphology modified to conical structure. This result has explained by the change of the droplets ejecting behavior with the development of the canonical structure at the target surface.

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