Determination of the field dependence of the intergranular critical current in a YBCO tube by horizontal traversals

The magnetic flux density in the cavity of a sintered tube of Yttrium Barium Copper Oxide (YBCO) is measured as a function of H∥, the axial magnetic field impressed and removed after zero field cooling (ZFC). We note that, in a short thick-walled hollow cylinder of a weak-linked polycrystalline high...

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Published inPhysica. C, Superconductivity Vol. 450; no. 1-2; pp. 34 - 39
Main Authors Çelebi, S., LeBlanc, M.A.R.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.12.2006
Elsevier Science
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical current density
Critical currents
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Return flux
Superconducting YBCO tube
Superconductivity
Critical current density
74.60.Ec
74.60.Ge
74.60.Jg
Return flux
Superconducting YBCO tube
Magnetic flux
Magnetization
Hollow cylinder
Magnetic field effects
Polycrystals
Magnetic hysteresis
Weak links
Barium oxides
Sintering
High-Tc superconductors
Copper oxides
Yttrium oxides
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Summary:The magnetic flux density in the cavity of a sintered tube of Yttrium Barium Copper Oxide (YBCO) is measured as a function of H∥, the axial magnetic field impressed and removed after zero field cooling (ZFC). We note that, in a short thick-walled hollow cylinder of a weak-linked polycrystalline high-Tc superconductor, the magnetic field in the cavity of the tube, Hzhole, rises above the applied field H∥ when it is initially increasing. Consequently the standard approach to determine the critical current density from an ascending sweep of H∥ alone, or a descending sweep alone cannot be exploited. However the field dependence of the intergranular critical current density Jcm can be reliably obtained from the horizontal traversals of Hzhole vs H∥. Comparison of the experimental data with model calculations for the horizontal traversals of the hysteresis curves show that the intergranular critical current density in the YBCO tube has a Kim-like field dependence. The magnetization of the grains has a significant influence on the flux density in the cavity of the tube.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2006.08.001