axis with the laser beam hitting a circumference of the target between the depositions the carousel itself would rotate about its own axis to place the ybco target in the laser beam thereby the buffer layer 12 would not be exposed to ambient conditions between the deposition steps the target for the laser deposition of the ybco layer 14 was a pellet of sintered powder of ybco the ybco was deposited to a thickness of about 200 nm after the depositions the film was cooled to room temperature at the rate of 12 u00b0 c min in 200 torr of oxygen the resistance of the film as a function of temperature was measured by a four probe dc technique the ybco film of the invention exhibited a superconducting transition temperature t c of 90 u00b0 k with a transition width u03b4t c of 1 u00b0 to 1 5 u00b0 k the ratio r 300 r 95 of the room temperature resistance to the resistance at 95 u00b0 k just above the transition was 2 2 the critical current density j c at which superconductivity deteriorates such that a voltage drop of 1 u03bcv cm is observed along the conductor was estimated both by magnetization measurements and by i v measurements using 125 u03bcm wide and.