Fabrication and properties of HTS diffusion type weak links

Author

Ivanov, Z.G. ; Brorsson, G. ; Claeson, T.

Author_Institution

Dept. of Phys., Chalmers Univ. of Technol., Gothenburg, Sweden

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

3324

Lastpage

3327

Abstract

Intentionally weakened links were produced by diffusing Al or Cu into the grain boundaries of microbridges of high-T_c superconductors. Thin and narrow (70-130 mm) strips of Al or Cu were deposited across previously patterned microbridges and diffused into them for a short time at 300-450°C. DC and RF Josephson properties were registered. I_cR_n products of up to 3 mV were measured at 4.2 K for a laser-ablated Bi-Pb-Ca-Sr-Cu-O film (T_c=64 K) and 0.9 mV at 77 K for a Y-Ba-Cu-O film (T_c=87 K). Problems with electron resist residues could be circumvented by depositing a thin layer of Ag on the high-T_c superconductor before further processing

Keywords

Josephson effect; aluminium; barium compounds; bismuth compounds; calcium compounds; copper; high-temperature superconductors; lead compounds; strontium compounds; superconducting junction devices; superconducting thin films; yttrium compounds; 300 to 450 degC; 64 K; 87 K; Al-BiPbCaSrCuO; Al-YBaCuO; Cu-BiPbCaSrCuO; Cu-YBaCuO; DC Josephson properties; HTS diffusion type weak links; RF Josephson properties; electron resist residues; grain boundaries; high-T_c superconductors; high-temperature superconductors; laser-ablated films; microbridges; Electrons; Fabrication; Grain boundaries; High temperature superconductors; Radio frequency; Resists; Strips; Superconducting films; Superconductivity; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133924

Filename

133924