Abstract
We have studied the effect of nonsuperconducting inclusions on the magnetization relaxation in melt-processed $R{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ $(R=\mathrm{Nd}$ and Yb) bulk superconductor in a high-temperature region $(77<~T<~90 \mathrm{K}).$ It is found that nonsuperconducting inclusions are mainly effective in reducing the normalized relaxation rate S $(\ensuremath{\equiv}\ensuremath{-}d\mathrm{ln}M/d\mathrm{ln}t)$ at low fields $[{b}_{\mathrm{irr}}(\ensuremath{\equiv}{\ensuremath{\mu}}_{0}{H}_{a}{/B}_{\mathrm{irr}})\ensuremath{\lesssim}0.1]$ and at high fields ${(b}_{\mathrm{irr}}\ensuremath{\gtrsim}0.4).$ A suppression in S is observed in an intermediate field region $(0.1\ensuremath{\lesssim}{b}_{\mathrm{irr}}\ensuremath{\lesssim}0.4)$ for the samples exhibiting secondary peak effect, suggesting a relation between the peak and the suppression.
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