An investigation on the critical current density of the melt-textured YBCO with Sm211 addition

Sm 2BaCuO 5 (Sm211) addition shows an improved critical current performance and the peak effect in the critical current density J c vs. applied field H curve at 77.3 K. The post-annealing at 950°C reduces the critical current density and eliminates the peak effect. The followed oxygenation cannot re...

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Bibliographic Details
Published inPhysica. C, Superconductivity Vol. 322; no. 1; pp. 53 - 56
Main Authors Zhang, H, Zou, X.W, Gong, S.M, Cai, C.B
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.1999
Subjects
Critical current density
Melt-textured-growth YBCO
Peak effect
Post annealing
Sm211 addition
Critical current density
74.72Bk
Melt-textured-growth YBCO
74.80Bj
Post annealing
Peak effect
74.60Jg
Sm211 addition
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Summary:Sm 2BaCuO 5 (Sm211) addition shows an improved critical current performance and the peak effect in the critical current density J c vs. applied field H curve at 77.3 K. The post-annealing at 950°C reduces the critical current density and eliminates the peak effect. The followed oxygenation cannot recover them completely, but it seems that a weak peak appears again after oxygenating at 450°C for 120 h. The peak behavior of J c may be connected with the formation and disappearance of the spatial inhomogeneous (Y,Sm)123 matrix, in which a local low- T c (Y,Sm)(Ba,Sm) 2Cu 3O y phase forms owing to the substitution of Sm for Ba sites, especially in Sm-rich regions.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(99)00379-2