Enhanced flux pinning in Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconductors tapes with addition of magnetic nanorod γ-Fe2O3

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作者：
Lau, K.T. [1 ]
Yahya, S.Y. [2 ]
Abd-Shukor, R. [3 ]
机构：
[1] Centre for Academic Services, Kolej Universiti Teknikal Kebangsaan Malaysia, Karung Berkunci 1200, 75450 Ayer Keroh, Melaka, Malaysia
[2] Faculty of Applied Sciences, Universiti Teknologi, MARA, 40450 Shah Alam, Selangor, Malaysia
[3] School of Applied Physics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
来源：
Journal of Applied Physics | 2006年 / 99卷 / 12期
关键词：
The pinning strength of the Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O tapes with the addition of magnetic nanorod γ-Fe2O3 is studied using the exponent n values obtained from power law current-electric field (I-E) characteristics. The starting composition of the γ-Fe2O 3 added samples is Bi1.6Pb0.4Sr 2Ca2Cu3O10-(γ-Fe 2O3)0.01. The rate of decrease of n values in applied fields for the tapes with nano-γ-Fe2O3 is found lower than the tapes without nano-γ-Fe2O3. This indicates that the pinning strength for the tapes with nano γ-Fe 2O3 is relatively higher than the tapes prepared without nano γ-Fe2O3. The results are supported by two conventional methods which are normally used to compare the pinning strength of superconductor tapes. Magnetic impurities generally suppress superconductivity. However; our study shows that magnetic nanorod γ-Fe2O 3 enhanced the pinning strength of Ag-sheathed Bi-Sr-Ca-Cu-O superconductor tapes. This is consistent with previous calculations on frozen flux superconductor with magnetic nanorod as pinning centers. © 2006 American Institute of Physics;
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