Transport E-J characteristics in Bi-2223 tape under the influence of bending strain: analysis by use of the percolation model

Citation
T. Kiss et al., Transport E-J characteristics in Bi-2223 tape under the influence of bending strain: analysis by use of the percolation model, PHYSICA C, 357, 2001, pp. 1123-1127
Citations number
3
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA C
ISSN journal
0921-4534 → ACNP
Volume
357
Year of publication
2001
Part
2
Pages
1123 - 1127
Database
ISI
SICI code
0921-4534(200108)357:<1123:TECIBT>2.0.ZU;2-N
Abstract
The influence of bending strain on the transport E-J characteristics in Bi- 2223 Ag/AgMg-alloy sheathed tape is studied by using the percolation model. Magnetic field- and temperature-dependent E-J characteristics in the tape have been measured at various conditions of bending strain. As the bending radius is reduced, the apparent critical current in the tape is reduced mai nly because of the reduction of geometrical cross-section area due to crack ing. However, if we extract the local current density taking into account t he cracking, it can be seen that the value of critical current density, J(c ), is enlarged due to the bending strain in the remained region. Namely, th e pinning strength in the remained region is enlarged as the bending strain is increased. It will be shown that the present method allows us to separa te the variation of the connectivity and the pinning strength originated fr om the strain. (C) 2001 Elsevier Science B.V. All rights reserved.