INFLUENCE OF PULSED LASER ENERGY DEPOSITION ON TRANSPORT-PROPERTIES AND STRUCTURE IN TRILAYER EPITAXIAL (Y PR)BA2CU3O7-X/SRTIO3 FILMS/

Modifications of the structural, compositional, and charge transport p roperties in an epitaxial trilayer YBa2Cu3O7-x/PrBa2Cu3O7/YBa2Cu3O7-x( Y23/Pr23/Y23) thin film on a single crystalline SrTiO3 (STO) substrate as a function of laser pulse fluence are investigated. A transition f rom the semiconductor-like temperature dependence of the electrical re sistance R(t) to that typical for a high-temperature superconducting t hin film is observed as a result of pulsed laser irradiation with lase r fluences up to almost-equal-to 2.0 J/cm2. The channeling regime in t he film is suppressed at fluence less than 0.7 J/cm2. Both observation s evidence the transformation of the single crystalline film into a po lycrystalline one with some texture. At fluences higher than almost-eq ual-to 2.0 J/cm2, the metallic properties degrade, though the temperat ure of the superconducting transition remains constant. Analysis of RB S spectra and R(T) data allows to consider the process of interdiffusi on between Y23 and Pr23 layers as incorporation and mixture of corresp onding superconducting and insulating grains.