DocumentCode
841716
Title
Critical current density enhancement in YBa2Cu3O7-δ thin films by twin domains of LaAlO3 substrates
Author
Ye, Zuxin ; Li, Qiang ; Si, W.D. ; Johnson, P.D.
Author_Institution
Brookhaven Nat. Lab., Upton, NY, USA
Volume
15
Issue
2
fYear
2005
fDate
6/1/2005 12:00:00 AM
Firstpage
3013
Lastpage
3015
Abstract
Magnetic flux penetration into a 0.2 μm-thick YBa2Cu3O7-δ (YBCO) thin film grown on a crystalline LaAlO3 (LAO) substrate was studied using magneto-optical imaging techniques. Enhanced critical current density Jc was observed at the location corresponding to twin domains on the underlying substrate. We attribute this Jc enhancement to increased pinning defects in the YBCO layer induced by the naturally formed nano-scaled surface roughness on the LAO substrate. Our results suggest that the substrate surface roughness might be helpful in Jc improvement of YBCO thin films grown on metal substrates by pulsed laser deposition.
Keywords
barium compounds; critical current density (superconductivity); domain boundaries; high-temperature superconductors; lanthanum compounds; magnetic flux; pulsed laser deposition; superconducting epitaxial layers; surface roughness; yttrium compounds; 0.2 micron; Jc enhancement; LAO substrate; LaAlO3; YBCO thin film; YBa2Cu3O7; critical current density; flux pinning; magnetic flux penetration; magneto-optical imaging; metal substrates; nano-scaled surface roughness; pinning defects; pulsed laser deposition; thin films; Critical current density; Crystallization; Magnetic films; Magnetic flux; Pulsed laser deposition; Rough surfaces; Substrates; Surface emitting lasers; Surface roughness; Yttrium barium copper oxide; Flux pinning; YBCO; magneto optical; superconductor;
fLanguage
English
Journal_Title
Applied Superconductivity, IEEE Transactions on
Publisher
ieee
ISSN
1051-8223
Type
jour
DOI
10.1109/TASC.2005.848705
Filename
1440303
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