Title :
Fabrication and characterization of ramp edge-type junction and SQUIDs
Author :
Alvarez, G.A. ; Kuroda, M. ; Matsuda, M. ; Miyamoto, K. ; Kasai, N. ; Koyanagi, M. ; Nemoto, T.
Author_Institution :
Electrotech. Lab., Tsukuba, Japan
fDate :
6/1/1995 12:00:00 AM
Abstract :
We have investigated the properties of high-T/sub c/ ramp-edge geometry Josephson weak links using superconducting YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) electrodes and PrBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//(PBCO) normal-metal layers. Unambiguous evidence of Josephson behaviour has been observed. Current-voltage characteristics (CVC) were qualitatively consistent with the resistively-shunted-junction (RSJ) model. Well developed Shapiro steps for 8.9 GHz microwave irradiation have been observed. Furthermore we have fabricated dc-SQUIDs with PBCO barriers that modulate up to a temperature of 80.6 K. At 4.2 K we find a flux-voltage modulation depth of /spl ap/36 /spl mu/V.<>
Keywords :
Josephson effect; SQUIDs; barium compounds; high-temperature superconductors; praseodymium compounds; pulsed laser deposition; superconducting device testing; superconducting junction devices; yttrium compounds; 36 muV; 4.2 K; 8.9 GHz; 8.9 GHz microwave irradiation; 80.6 K; Josephson behaviour; PrBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// normal-metal layers; SQUID; Shapiro steps; YBCO electrodes; YBa/sub 2/Cu/sub 3/O/sub 7/-PrBa/sub 2/Cu/sub 3/O/sub 7/; characterization; current-voltage characteristics; dc-SQUID; fabrication; flux-voltage modulation depth; igh-T/sub c/ ramp-edge geometry Josephson weak links; ramp edge-type junction; resistively-shunted-junction model; superconducting YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//; Current-voltage characteristics; Electrodes; Fabrication; Geometry; Josephson junctions; SQUIDs; Superconducting epitaxial layers; Superconducting microwave devices; Temperature; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
