Abstract
The single crystal of YBa2(Cu1-xFex)3Oy has been grown from a mixed region of solid Y2BaCuO5 and melt. The Ostwald ripening mechanism plays an important role for growth of large single crystal. The oxygen concentration of single crystal is controlled by oxygen-or nitrogen-annealing under various conditions. The single crystal of YBa2(Cu0.97Fe0.03)3Oy annealed in flowing O2 gas shows a sharp superconductive transition at about 90K. The iron concentration included in the single crystal of YBa2(Cu1-xFex)3Oy, which is determined by EPMA, increases with an increase of x, but is less than the nominal content x.
