Abstract
High purity, highly ordered and twin free ortho-II phase YBa 2Cu 3O 6.50 crystals have been successfully prepared and their structural properties characterized by X-ray diffraction. Removal of twin boundaries was found to be essential in order to obtain highly ordered ortho-II crystals. The ortho-II phase shows a sharp superconducting transition at T c=62 K, 5 K higher than the ortho-I phase of the same oxygen content. The ordering was found to be three-dimensional with long correlation lengths ξ a=148 Å, ξ b=430 Å and ξ c=58 Å. No doubling of the unit lattice along the c-direction was observed, indicating an attractive interaction between oxygen ions in adjacent basal planes.
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