STOICHIOMETRY AND SUPERCONDUCTIVE PROPERTIES OF YBACUO FILMS DEPOSITED BY SPRAY-PYROLYSIS

The dependence of the stoichiometry and the superconducting characteri stics of YBaCuO films deposited by spray pyrolysis on the spraying sol ution composition and the deposition conditions is reported. It has be en found that a proper optimization of the starting materials concentr ation in the spraying solution results in superconducting films with z ero resistance temperature of 91 K and a transition to superconducting state within a 3 K range. X-ray diffraction and resistance vs tempera ture measurements have been used to monitor the crystal composition an d the conductive characteristics of the films as a function of the spr aying solution composition and the deposition parameters.