Experimental analysis of superconducting properties of Y-Ba-Cu-O/Ag proximity interfaces

Author

Fujimaki, A. ; Takai, Y. ; Hayakawa, H.

Author_Institution

Dept. of Electron., Nagoya Univ., Japan

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

1353

Lastpage

1356

Abstract

The electrical properties of YBa₂Cu₃O_7-y/Ag proximity interfaces are reported. In order to study these properties, SNS (superconductor/normal metal/superconductor) junctions made of YBa₂Cu₃O _7-y/Ag/Nb thin films and SNIS (superconductor/normal metal/insulator/superconductor) junctions made of YBa₂Cu₃O_7-y/Ag/AlO_x/Nb thin films were examined. Experimental results on the SNS junctions imply that weak links are formed inside YBa₂Cu₃O_7-y and that the junction properties depend on the area of the surface nonsuperconducting phases. The J_c-R _n relationship and the R_n-T characteristics suggest the presence of nonsuperconducting phases grown partially on the YBa₂Cu₃O_7-y surfaces. The results on the SNIS junctions show little superconductivity induced in the Ag layers by the YBa₂Cu₃O_7-y films

Keywords

aluminium compounds; barium compounds; electronic conduction in insulating thin films; high-temperature superconductors; niobium; proximity effect; silver; superconducting junction devices; type II superconductors; yttrium compounds; J_c-R_n relationship; R_n-T characteristics; YBa₂Cu₃O_7-y-Ag-AlO_x-Nb; YBa₂Cu₃O_7-y-Ag-Nb; electrical properties; high temperature superconductors; proximity interfaces; superconducting properties; surface nonsuperconducting phases; type II superconductors; weak links; Conducting materials; Conductive films; High temperature superconductors; Niobium; Proximity effect; Superconducting devices; Superconducting films; Superconducting thin films; Superconductivity; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133434

Filename

133434