Mixing characteristics of a microwave detector using a granular YBCO superconductor

Microbridge-type Josephson junctions made of granular bulk YBCO superconductors were experimentally studied at microwave frequencies. Although the bridge included many grain boundaries, clear Shapiro steps were induced at every hf/2e voltage for microwave frequencies, and step height dependence for...

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Bibliographic Details
Published in:IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) 1991-03, Vol.27 (2), p.3073-3076
Main Authors: Yoshisato, Y., Takai, M., Niki, K., Yoshikawa, S., Hirano, T., Nakano, S.
Format: Article
Language:English
Subjects:
440800 > Miscellaneous Instrumentation-- (1990-)
665411 > Basic Superconductivity Studies-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
AMPLITUDES
Applied sciences
BARIUM COMPOUNDS
BARIUM OXIDES
Bridge circuits
CHALCOGENIDES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DATA
Detectors
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
Electronics
Exact sciences and technology
EXPERIMENTAL DATA
FABRICATION
GRAIN BOUNDARIES
Granular superconductors
Hafnium
HETERODYNE RECEIVERS
INFORMATION
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
JUNCTIONS
MICROSTRUCTURE
MICROWAVE EQUIPMENT
Microwave frequencies
MICROWAVE RADIATION
NONLINEAR PROBLEMS
NUMERICAL DATA
OTHER INSTRUMENTATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RADIO EQUIPMENT
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SENSITIVITY
Signal detection
Superconducting devices
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
Voltage
Yttrium barium copper oxide
YTTRIUM COMPOUNDS 665412 > Superconducting Devices-- (1992-)
YTTRIUM OXIDES
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Summary:Microbridge-type Josephson junctions made of granular bulk YBCO superconductors were experimentally studied at microwave frequencies. Although the bridge included many grain boundaries, clear Shapiro steps were induced at every hf/2e voltage for microwave frequencies, and step height dependence for microwave power similar to that of a single weak link bridge was observed. A heterodyne mixing experiment of microwaves at about 20 GHz was also performed using the detector. The IF signal showed peak amplitudes corresponding to the peak dynamic resistance due to nonlinearity resulting from the Josephson effect. It was confirmed that the detector operates stably for the Josephson-effect heterodyne mixer at 60 K or below. The detector has potential for high sensitivity and good impedance matching due to its large dynamic resistance and high normal state resistance, respectively.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.133861