Growth of Polyhedral YBa2Cu3Ox Single Crystals and Their Anisotropic Properties

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Abstract
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°C and then cooled to 990-970°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.