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The growth of superconducting YBC single crystals with millimeter dimen-sions by Czochralski technigue is reported in this paper.In the experiment a mixture of Y_2O_3(3wt%),BaCO_3(47.4wt%)and CuO(49.6wt%)was prepared and ground with a mortar and pestle.And an Al_2O_3crucible was used.To avoid the decomposition of the mixed raw materials by