Abstract
Single crystals of Nd1+xBa2−xCu3O6+δ (Nd123) have been successfully grown by the top-seeded solution-growth (TSSG) method using BaO-CuO solvent in a Nd2O3 crucible as a solute source. Furthermore, compositions of 123 compounds could be controlled applying two different methods which were the oxygen partial pressure control of the atmosphere during growth and/or controlling liquid composition. Using the BaO-CuO solvent with the Ba/Cu ratio of 3/5, near-stoichiometric Nd123 single crystals were grown under a reduced oxygen partial pressure atmosphere (P(O2)=1.013×103 Pa). Even in the air atmosphere, the Ba-enriched liquid with the Ba/Cu ratio of 4/5 made it possible to obtain the almost stoichiometric Nd123 single crystal as well.Moreover, to investigate whether the peak effect in Jc-H curve is an intrinsic property for Nd123 or not, different series of heat treatment were performed using near-stoichiometric Nd123 single crystals grown by the above-mentioned TSSG method.
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