Periodical distribution of Y-Ba-Cu-O particles were obtained on amorphous Y
-Ba-Cu-O films with 5-20 laser pulses in the energy density of 0.1 J/cm(2)
X-ray diffraction patterns showed that the particles were polycrystalline.
Scanning electron microscopy studies revealed that half-spherical or even s
pherical particles were formed on the films. The diameters of the U-Ba-Cu-O
particles were found to be dependent on film thickness, and sub-micro Y-Ba
-Cu-O spherical particles with diameters of 250 nm have been obtained in 20
0 nm-thick Y-Ba-Cu-O films.