Two- and three-dimensional connectivity and current distribution in Y Ba2 Cu3 Ox -coated conductors

D. C. Van Der Laan, M. Dhalĺ, H. J.N. Van Eck, A. Metz, B. Ten Haken, H. H.J. Ten Kate, L. M. Naveira, M. W. Davidson, Justin Schwartz

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Abstract

The microstructure of Y Ba2 Cu3 Ox (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.

Original languageEnglish (US)
Article number032512
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number3
DOIs
StatePublished - Jan 17 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Van Der Laan, D. C., Dhalĺ, M., Van Eck, H. J. N., Metz, A., Ten Haken, B., Ten Kate, H. H. J., Naveira, L. M., Davidson, M. W., & Schwartz, J. (2005). Two- and three-dimensional connectivity and current distribution in Y Ba2 Cu3 Ox -coated conductors. Applied Physics Letters, 86(3), 1-3. [032512]. https://doi.org/10.1063/1.1855414