TITLE

Two- and three-dimensional connectivity and current distribution in YBa2Cu3Ox-coated conductors

AUTHOR(S)
van der Laan, D. C.; Dhallé, M.; van Eck, H. J. N.; Metz, A.; ten Haken, B.; ten Kate, H. H. J.; Naveira, L. M.; Davidson, M. W.; Schwartz, J.
PUB. DATE
January 2005
SOURCE
Applied Physics Letters;1/17/2005, Vol. 86 Issue 3, p032512
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The microstructure of YBa2Cu3Ox (YBCO)-coated conductors depends strongly on the deposition method and thickness of the YBCO layer. This letter shows how the clear qualitative difference in grain connectivity between vacuum-deposited and solution-grown layers has direct consequences for the spatial distribution of the critical current density (Jc). Pulsed-laser-deposited YBCO conductors usually have a columnar grain structure that results in a two-dimensional current network, as demonstrated with magneto-optical imaging. Consequently, their transport Jc varies considerably on length scales from 50 μm up to 5 mm, with current suppression occurring even at defects that run parallel to the macroscopic current. In contrast, the thicker YBCO coatings in metalorganic-deposited samples have a layered structure, leading to a three-dimensional current path. Magneto-optically, this is deduced from sample-wide shielding currents, while transport experiments reveal much smaller spatial variations in Jc. These results are encouraging for the further development of nonvacuum produced YBCO-coated conductors, since such three-dimensional systems are inherently more “forgiving” of local defects.
ACCESSION #
16345263

 

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