EFFECT OF PROCESSING CONDITIONS ON SUPERCONDUCTIVE PROPERTIES OF LASER-DEPOSITED YBCO THIN-FILMS

Thin superconductive films of YBa2Cu3O7-x have been deposited on (1 00 ) single crystal SrTiO3 substrates by using technique of ArF pulse exc imer laser evaporation of bulk YBCO target in a vacuum, followed by sl ow cooling in an oxygen atmosphere. Thin-film properties are strongly influenced by the processing conditions. The effect of pulse repetitio n rate, beam power, beam size on the target surface and oxygen pressur e on the surface morphology and superconductive properties of deposite d films has been investigated. Film characterization has been performe d by using X-ray diffractometry, scanning electron microscopy and four -point probe electrical instruments.