GROWTH OF POLYHEDRAL YBA2CU3OX SINGLE-CRYSTALS AND THEIR ANISOTROPIC PROPERTIES

Polyhedral single crystals of oxide superconductor YBa2Cu3O(x) have been grown under the condition where the solid phase Y2BaCuO5 and liquid phase coexist. The crystals obtained possess well-developed habits and have a thickness of up to 3 mm along the c-axis, when the solid-melt mixture is kept at 1050-1010-degrees-C and then cooled to 990-970-degrees-C. The annealed crystals show a sharp superconductive transition at 91 K. The temperature dependence of resistivity is found to be metallic both in the ab- and c-directions. A marked anisotropy in the broadening of the resistive transition is observed under magnetic fields parallel or perpendicular to the c-axis.