Abstract
Abstract In the present work, we have performed a detailed comparative study of the irreversibility line (IL) among flux-grown NdBa 2 Cu 3 O 7−d (Nd123) single crystal, melt-grown Nd-Ba-Cu-O (NdBCO) and melt-grown Y-Ba-Cu-O (YBCO) bulks by d.c. magnetometry and a.c. susceptometry. ILs were determined by measuring d.c. magnetization hysteresis loops, the fundamental χ 1 and third harmonic χ 3 signals of a.c. susceptibility for the fields parallel to the c -axis of samples ( H // c ). Among these, melt processed NdBCO exhibited the highest IL. On reduced temperature scale, however, ILs from the χ 3 signals for melt-grown NdBCO and YBCO tended to merge together, suggesting that real depinning lines are insensitive to the field-induced flux pinning centers existing in NdBCO, including the flux-grown sample, but are rather sensitive to the secondary phase inclusions existing in melt-grown samples.
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