High current pressure contacts to Ag pads on thin film superconductors

Author

Goodrich, L.F. ; Srivastava, A.N. ; Stauffer, T.E. ; Roshko, A. ; Vale, L.R.

Author_Institution

Div. of Electromagn. Technol., Nat. Inst. of Stand. & Technol., Boulder, CO, USA

Volume

4

Issue

2

fYear

1994

fDate

6/1/1994 12:00:00 AM

Firstpage

61

Lastpage

64

Abstract

High current, low resistance, nonmagnetic, and nondestructive pressure contacts to Ag pads on YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) thin film superconductors were developed in this study. The contact resistance reported here includes the resistance of the current lead/Ag pad interface, the Ag pad/YBCO interface, and the bulk resistance of the contact material. This total contact resistance is the relevant parameter which determines power dissipation during critical-current measurements. It was found that regardless of the optimization of the Ag pad/YBCO interface through annealing, a pressure contact can yield a lower total resistance than a soldered contact. The lowest resistance obtained with pressure contacts was 3 /spl mu//spl Omega/ (for a 2/spl times/4 mm/sup 2/ contact). These contacts may be useful for many different high temperature superconductor (HTS) studies where high-current contacts with low heating are needed.<>

Keywords

barium compounds; contact resistance; critical current density (superconductivity); electrical contacts; high-temperature superconductors; silver; superconducting thin films; yttrium compounds; 3 muohm; Ag-YBa/sub 2/Cu/sub 3/O/sub 7/; Ag/YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// interface; bulk resistance; contact resistance; critical-current measurements; high current pressure contacts; high temperature superconductor; low heating; power dissipation; total resistance; Contact resistance; Electrical resistance measurement; High temperature superconductors; Lead; Power dissipation; Superconducting materials; Superconducting thin films; Superconductivity; Transistors; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.291692

Filename

291692