Title :
Properties of the microwave SQUID with an YBaCuO point contact junction
Author :
Ryhänen, T. ; Seppä, H.
Author_Institution :
Electr. Eng. Lab., Tech. Res. Centre of Finland, Espoo, Finland
fDate :
3/1/1989 12:00:00 AM
Abstract :
A high-sensitivity microwave SQUID (superconducting quantum interference device), suitable for RF attenuation measurements, is constructed taking advantage of the low density of states of current carriers in high-Tc materials. The dynamics, the noise properties, and the sensitivity of the microwave SQUID are theoretically analyzed. The ultimate energy resolution of the waveguide SQUID is inversely proportional to the characteristic frequency ω c=Rq/L of the loop. ωc is high for YBaCuO junctions at 4.2 K because of small leakage. A flux sensitivity of 4×104-6 φ0/√Hz has been achieved, which is in good agreement with the theoretical predictions
Keywords :
SQUIDs; barium compounds; electron device noise; high-temperature superconductors; point contacts; solid-state microwave devices; waveguide components; yttrium compounds; RF attenuation measurements; YBaCuO point contact junction; current carrier density of states; dynamics; energy resolution; flux sensitivity; high temperature superconductor; high-sensitivity microwave SQUID; noise properties; waveguide SQUID; Attenuation measurement; Radio frequency; Radiofrequency interference; SQUIDs; Superconducting device noise; Superconducting devices; Superconducting materials; Superconducting microwave devices; Waveguide junctions; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
