PHOTOINDUCED PHENOMENA IN HTSC FILMS OF Y BA2CU3O6+DELTA

The effect of light illumination on spectral and current-carrying prop erties of YBa2Cu3O6+delta epitaxial films with different oxygen index a has been considered. It has been shown that within the range of 0.5 < delta < 0.75 the illumination leads both to resistance decreasing an d changes of absorption spectrum equivalent to oxygen index rise. It h as been also shown that even delta > 0.75 light illumination effects t he current-carrying characteristics of the films. It causes changing o f critical current density while the temperature dependence of resista nce is left unchanged.