Abstract
In this paper we report an effective procedure for the growth of large superconducting YBCO single crystals by using a double crucible method which facilitates detachment of the as-grown crystals from flux. As-grown crystals with dimensions up to 5 × 5 mm 2 have been obtained. The Superconducting transition occurs at about 90 K. The growth principle is based on the melt growth and phase separation method. We find that by using BaO 2 instead of BaCO 3 as raw material, the quality of as-grown crystals was much better and the superconducting transition temperature was a few degrees higher than in case of using BaCO 3.
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