High performance superconducting thin films on large area substrates

Author

Lauder, A. ; Wilker, C. ; Kountz, D.J. ; Holstein, W.L. ; Face, D.W.

Author_Institution

Du Pont Central Res. & Dev., Wilmington, DE, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1683

Lastpage

1686

Abstract

The first fabrication of 3-in-diameter, thin films of thallium-based superconductors is reported. (Tl/sub 0.5/Pb/sub 0.5/)Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 9/ thin films on LaAlO/sub 3/ are found to display the best surface resistance (R/sub s/) properties of any superconductor at higher temperatures and show approximately 50* better performance than copper at 100 K and 10 GHz. A Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/ thin film, processed as a 1.8-m-long, 10- mu m-wide meander line carries about 1*10/sup 7/ A/cm/sup 2/ at 4.2 K and 2*10/sup 6/ A/cm/sup 2/ at 80 K. The thallium-based superconductors are compared to YBa/sub 2/Cu/sub 3/O/sub 7/ with respect to T/sub c/, R/sub s/, and Q.<>

Keywords

annealing; barium compounds; high-temperature superconductors; lead compounds; sputter deposition; superconducting thin films; superconducting transition temperature; surface conductivity; thallium compounds; yttrium compounds; 1.8 m; 10 GHz; 100 K; 3 inch; 4.2 K; 80 K; LaAlO/sub 3/ substrate; RF magnetron sputtering; Tl/sub 0.5/-Pb/sub 0.5/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 9/; Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/; YBa/sub 2/Cu/sub 3/O/sub 7/; annealing; large area substrates; quality factor; superconducting thin films; surface resistance; Composite materials; Copper; Fabrication; High temperature superconductors; Substrates; Superconducting materials; Superconducting microwave devices; Superconducting thin films; Superconductivity; Surface resistance;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233789

Filename

233789