Title :
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
fDate :
6/1/1995 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
