Title :
Preparation and properties of all high Tc SNS-type edge DC SQUIDs
Author :
Gao, J. ; Aarnink, W.A.M. ; Gerritsma, G.J. ; Veldhuis, D. ; Rogalla, H.
Author_Institution :
Fac. of Appl. Phys., Twente Univ., Enschede, Netherlands
fDate :
3/1/1991 12:00:00 AM
Abstract :
High-Tc SNS-type Josephson junctions and DC SQUIDs were successfully fabricated using hetero-epitaxially grown multilayers of YBa2Cu3Ox and PrBa2 Cu3O. These layers are c-axis oriented, and hence edges of the multilayers give rise to a current flow in the ab-plane between the electrodes of a Josephson junction. The necessary structuring was done by Ar ion beam etching. The individual junctions exhibit a supercurrent up to 80 K. The IcRn product of these junctions usually has a lower limit of 8 mV at 4.2 K. Voltage modulation of the first DC SQUIDs can be observed up to 66 K. The voltage modulation for various bias currents investigated at 4.2 K noise measurements were performed. Details on the fabrication and measurements are presented
Keywords :
SQUIDs; barium compounds; high-temperature superconductors; praseodymium compounds; superconducting epitaxial layers; yttrium compounds; 4.2 to 80 K; 8 mV; Ar ion beam etching; DC SQUIDs; Josephson junctions; YBa2Cu3Ox-PrBa2Cu 3Ox-YBa2Cu3Ox; fabrication; hetero-epitaxially grown multilayers; high temperature superconductors; preparation; properties; voltage modulation; Argon; Electrodes; Etching; Ion beams; Josephson junctions; Noise measurement; Nonhomogeneous media; Performance evaluation; SQUIDs; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
