Abstract
Abstract Single crystals of oxide superconductor (ErBa2Cu307-δ) were grown from a liquid phase using an excess CuO + BaO as a flux. The crystals were square thin plates (3 × 3 × 0.1mm3) with large (001) faces on which various kinds of growth layers were developed including growth spirals. There was a certain correlation between Tc and the twinning. The measurements of Tc showed a large scatter in the value of Tc ranging from 65 to 90 K, in spite of a prolonged annealing and slow cooling in air or oxygen atmosphere. However, we found out for the first time a method to improve Tc by treating the solidified ingot in molten CrO3. It turned out that the value of Tc before this treatment was improved to the extent of 85 to 92 K.
Published Version
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