Properties of the microwave SQUID with an YBaCuO point contact junction

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-T/sub c/ materials. The dynamics, the noise properties, and the sensitivity of the micr...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 25; no. 2; pp. 881 - 884
Main Authors Ryhanen, T., Seppa, H.
Format Journal Article
LanguageEnglish
Published IEEE 01.03.1989
Subjects
Attenuation measurement
Radio frequency
Radiofrequency interference
SQUIDs
Superconducting device noise
Superconducting devices
Superconducting materials
Superconducting microwave devices
Waveguide junctions
Yttrium barium copper oxide
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Summary: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-T/sub c/ 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 omega /sub c/=R/sub q//L of the loop. omega /sub c/ is high for YBaCuO junctions at 4.2 K because of small leakage. A flux sensitivity of 4*10/sup 4-6/ phi /sub 0// square root Hz has been achieved, which is in good agreement with the theoretical predictions.< >
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ISSN:0018-9464
1941-0069
DOI:10.1109/20.92427