Growth of (Pb0.75Cu0.25)Sr2(Y1− y Ca y )Cu2O7 thin films by laser ablation

In this letter we investigate the effects of varying the values of x and y in (Pb1−xCux)Sr2(Y1−yCay)Cu2O7 films deposited by laser ablation. The films are grown in situ on (100) LaAlO3 at the relatively low substrate temperature of 620 °C. The films are highly oriented with the c-axis perpendicular to the substrate and exhibit a surface morphology which is unique to the oxide superconductors. By substituting Ca for Y it is possible to …