Modulation of the peak effect in melt-processed (Sm[sub 1-x]Eu[sub x])Ba[sub 2]Cu[sub 3]O[sub 7-δ] superconductors with compositional fluctuation

Hu, A.; Zhou, H.; Sakai, N.; Murakami, M.
December 2002
Applied Physics Letters;12/16/2002, Vol. 81 Issue 25, p4796
Academic Journal
The peak effect in melt-processed (Sm[sub 1 - x]Eu[sub x])Ba[sub 2]Cu[sub 3]O[sub 7 - δ]crystals was modified with varying initial Sm/Eu ratios and was investigated up to 9 T down to 4.2 K. The experiment unveiled a linearly-temperature-dependent magnetization peak B[sub p](T). The fitting yielded a slightly lower critical temperature than bulk transition temperature T[sub c] at null field. The scaling analysis of normalized pinning force versus reduced field B/B[sub irr], where B[sub irr] is the irreversible field, showed a low peak at 0.37 in (Sm[sub 0.75]Eu[sub 0.25])Ba[sub 2]Cu[sub 3]O[sub 7 - δ] and at 0.5 in (Sm[sub 0.25]Eu[sub 0.75])Ba[sub 2]Cu[sub 3]O[sub 7 - δ]. The presence of regular compositional modulation is evident in both cases with transmission electron microscopy, and fluctuation diminishes in the latter composition. The modulation of flux pinning was thus attributed to the controlled compositional fluctuation.


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