Abstract
Excimer laser annealing is a novel scheme to reduce the surface weak-link of the high- T c superconductors. In the present work, we studied the optimal energy density of excimer laser and the effect of the overlapped area of the laser spots on the BSCCO(2223) samples using Kr–F excimer laser. The superconductor pellets were exposed to the laser with step-and-repeat process, and were then sintered. To form tightly linked intergrain boundaries, such optimal condition was experimentally determined as to have neither overlapping nor separation of the adjacent laser spots on the pellets, for an optimized laser energy density of 0.3–0.4 J/cm 2. When the exposure condition was deviated from the optimal one, the superconductors showed much decrease in critical temperature T c.
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