Abstract
Y1−xRExBa2Cu3O7−δ [Y(RE)BCO or REsBCO] superconductors were prepared by the crystal pulling method. The RE mixing content x in the crystal can be effectively controlled by the processing temperature. With an increase in processing temperature, the RE concentration in the liquid increased, which resulted in the higher RE substitution content in single crystals. The higher critical temperatures Tc above 92 K could be obtained by an optimized oxygenation treatment. The Tc value of Y(RE)BCO tends to be insensitive to the growth atmosphere of the oxygen partial pressure under a certain limit of the RE content. The Y.727Nd.273Ba2Cu3O7−δ and the Y.941Sm.059Ba2Cu3O7−δ samples show values of the critical current density Jc are about 2×104 Acm−2 at 1.2 T and 2.8×104 Acm−2 at 1.1 T for H//c, respectively, indicating that mixing REs 123 have obvious effects on Jc–H curves since RE ions are likely to substitute at both Y2+ and Ba2+ sites.
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