Phone: þ82 42 821 5451, Fax: þ82 42 822 8011 Iridate nanoparticle AIrO 3 (A ¼ Sr, Ba) incorporated Bi 2 Sr 2-CaCu 2 O 8 þ d (Bi-2212) thin films were successfully grown using pulsed laser deposition with post-growth ex situ heat treatment. Nanosized particles of SrIrO 3 (Sr-iridate) and BaIrO 3 (Ba-iridate) were deposited on top of MgO (100) substrate, followed by Bi-2212 layers to investigate their effects on the physical and superconducting properties of Bi-2212 thin films. The number of laser pulses was changed from 450 to 1800 to control the density of iridates in the Bi-2212 matrix. The composite film is then partial-melted at 890 8C for 15 min and annealed at 8508C for 5 h in ambient air. Scanning electron microscopy shows that the surfaces of thin films with iridates are more compact with minimal voids and porosity than those of pure Bi-2212 thin films. Both types of iridate incorporation suppress T c-zero of Bi-2212 thin films. Incorporating Sr-iridate in the Bi-2212 strongly affects T c-zero than those with Ba-iridate at low density. However, both iridate incorporations result in the expansion of the c-axis lattice constant and variation of Bi/Sr ratio of Bi-2212 films. On the other hand, we observed improvement of the activation energy, U 0 , as well as the selffield critical current density, J c (0), of Bi-2212 films with incorporated iridates even with suppressed T c-zero .

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