Title :
Properties of trilayer SIS junctions with YBa2Cu3 O7-y
Author :
Jiang, You-Song ; Moriya, Masataka ; Kobayashi, Tadayuki ; Goto, Toshinari
Author_Institution :
Univ. of Electro-Commun., Tokyo, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
In this study, we compared the surface configurations of PrGaO3 (PGO) and multilayers of PGO and CeO2 deposited on YBa2Cu3O7-y (YBCO) thin films. It is found that the multilayers have flatter surfaces than single layers of the same thickness. Furthermore, the voltage-current characteristics of sandwich type SIS junctions with a range of single barrier and double barrier thickness using YBCO electrodes were investigated. Double layer barriers are effective in suppressing electrical short circuits caused by pinholes. The junction with a double barrier of 5 nm PGO and 2.5 nm CeO2 shows a Josephson current
Keywords :
Josephson effect; barium compounds; high-temperature superconductors; superconducting thin films; yttrium compounds; Josephson tunnel junction; PGO surface; PGO-CeO2 multilayer; PrGaO3; PrGaO3-CeO2; YBCO thin film; YBa2Cu3O7; double barrier; electrical short circuit; pinhole; single barrier; trilayer SIS junction; voltage-current characteristics; Counting circuits; Electrodes; Gold; Nonhomogeneous media; Sputtering; Substrates; Surface morphology; Telephony; Temperature; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
