Abstract
We have studied the effect of a small amount of Y-site substitution by La or Pr ions on the vortex pinning in the Y–Ba–Cu–O system. ( Y 1 - x La x ) –Ba–Cu–O and ( Y 1 - x Pr x ) –Ba–Cu–O bulks were fabricated by the melt-textured growth, in which x was varied from 0 to 0.01. The critical current density J c at 77 K is improved in magnetic fields parallel to the c-axis above 2–4.5 T and the corresponding irreversibility field, H irr , shifts to the higher value in both bulks.
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