YBa2Cu3O9-δ single crystals in the shape of a needle and a square plate were grown from a CuO-rich solution at a high temperature. The maximum size of the platy crystals with superconductivity was about 1.5×1×0.2 mm3. The details of the growth procedures of the single crystals are reported here.
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Hayashi et al. (1987) studied this question.
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