Abstract
YBa2Cu3O6 + d superconductive crystals are formed by top-seeded solution growth under a temperature gradient in which the nutrient is a Y2BaCuO5 phase on the bottom and the solvent is molten barium cuprate with the cation ratio of Ba:Cu = 3:5. The crystal misorientation (< 0.2°) was determined by neutron diffraction. The superconducting transition temperature was about 90 K after appropriate oxygenation. Praseodymium-substituted crystals, (PrxY1 ± x)Ba2Cu3O6 + d, were also grown by adding PrBaO3 + BaCuO2 · 2CuO into the solution. We observed different types of growth steps on crystallographically different surfaces. The growth steps on the (001) face were formed by one lattice constant of c-axis height, while those on the (100) face were composed of macrosteps 60 nm high and microsteps about 1 nm high.
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