Anomalous temperature dependence of critical current in YBaCuO/PrBaCuO/YBaCuO trilayer Josephson junctions

Author

Akoh, H. ; Sato, H. ; Takada, S.

Author_Institution

Electrotech. Lab., Ibaraki, Japan

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2373

Lastpage

2376

Abstract

We have observed an anomalous temperature dependence of the critical current I/sub c/ in all (103)-oriented YBaCuO/PrBaCuO/YBaCuO trilayer Josephson junctions with barrier thicknesses of 50 nm and an Ar plasma treatment for the barriers. I/sub c/ of the junction increases drastically at around 40 K as temperature is increased, has a maximum value at about 65 K, and decreases towards the critical temperature of the junction. The normal resistance of the junction, on the other hand, decreases exponentially with increasing temperature. The anomalous temperature dependence of I/sub c/ may come from the proximity effect, taking into account the semiconductor-like properties of the PrBaCuO barrier.<>

Keywords

Josephson effect; barium compounds; critical currents; high-temperature superconductors; praseodymium compounds; proximity effect (superconductivity); superconducting device testing; superconducting junction devices; yttrium compounds; (103) orientation; 4.2 to 68 K; 50 nm; Ar plasma treatment; PrBaCuO barrier; YBaCuO-PrBaCuO-YBaCuO; YBaCuO/PrBaCuO/YBaCuO trilayer Josephson junctions; anomalous temperature dependence; barrier thickness; critical current; normal resistance; proximity effect; semiconductor-like properties; Argon; Critical current; Fabrication; Josephson junctions; Mechanical factors; Plasma applications; Plasma temperature; Substrates; Temperature dependence; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403063

Filename

403063