Enhanced current flow through meandering and tilted grain boundaries in YBCO films

Grain boundaries (GBs) have been shown to limit critical current density, Jc, in YBa2Cu3O7 (YBCO) coated conductors. Here we use transport measurements and scanning Hall probe microscopy coupled with current reconstruction to demonstrate that GB geometry, such as the in-plane meandering observed in...

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Bibliographic Details
Published inarXiv.org
Main Authors Dinner, Rafael B, Moler, Kathryn A, Feldmann, D Matthew, Beasley, M R
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 03.01.2007
Subjects
Angles (geometry)
Conductors
Critical current density
Grain boundaries
Hall probes
Substrates
YBCO superconductors
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Summary:Grain boundaries (GBs) have been shown to limit critical current density, Jc, in YBa2Cu3O7 (YBCO) coated conductors. Here we use transport measurements and scanning Hall probe microscopy coupled with current reconstruction to demonstrate that GB geometry, such as the in-plane meandering observed in films grown by metalorganic deposition (MOD) on rolling assisted biaxially textured substrate (RABiTS), can lead to higher GB Jc. We observe current-induced flux entry into such a coated conductor, then model its behavior by imaging films with single, straight GBs tilted at various angles to the applied current.
ISSN:2331-8422
DOI:10.48550/arxiv.0701047