Infrared pulsed laser deposition of yttrium doped BSCCO superconducting films

High T_c superconducting Bi₂Sr₂Ca_1-xY_xCu₂O_8+δ (Bi-22Y2) with 0.25≤x≤0.49 were deposited on MgO (100) by infrared (1064 nm) pulsed laser deposition with subsequent heat treatments. As- deposited films were partially melted and subsequently annealed in ambient air. The as-deposited films exhibit spheriodal morphology but maintain the stoichiometry of the target. After heat treatments steps, relatively smooth and flat films were achieved. Grain boundaries become more apparent at higher yttrium doping. The films are highly c-axis oriented. The zero resistance temperature T_c increases from 85 K to 90.5 K but drop with additional Y until 87 K. The highest critical current density obtained is 723.14 A/cm² at 70 K for 28% Y-doped sample under zero field.