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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/4668

Title: Properties of aligned YBa2Cu3O7−δ superconductor as a function of oxygen deficiency δ
Authors: Ossandon, J.G.
Thompson, J.R.
Christen, D.K.
Sun, Y.R.
Sales, B.C.
Kerchner, H.R.
Tkaczyk, J.E.
Lay, K.W.
Issue Date: 1993
Publisher: Elsevier Science Ltd.
Citation: Applied Superconductivity 1 (3-6): 371-380
Abstract: Systematic studies of flux pinning and intragrain critical current Jc were conducted in magnetically aligned, sintered Y1Ba2Cu3O7−δ material as a function of oxygen deficiency δ in the range 0 ˜ 0.2. The essential findings are: 1. (1) maximum Jc occurred at full oxygenation, i.e., Jc and pinning decreased steadily as oxygen was removed; 2. (2) the irreversibility line Birr(T, δ) was degraded with the introduction of oxygen defects; 3. (3) this degradation was strongly correlated with the reduction of Jc(δ), implying that the irreversibility line is determined by the strength of the flux pinning defects; 4. (4) the condensation energy Fc decreased significantly with δ, indicating a rapid weakening in the effectiveness of pre-existing pinning centers; 5. (5) both λ and ξ increased as oxygen was removed, while 6. (6) their ratio κ and the superconductive anisotropy parameter γ = (λc/λab) ≈ 5 varied little for δ
Description: Ossandon, J.G. Department of Engineering Sciences, Universidad de Talca, Curicó, Chile.
URI: http://dspace.utalca.cl/handle/1950/4668
ISSN: 0964-1807
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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