Spectral response of point-contact Josephson junctions

Journal Article · Tue Feb 01 04:00:00 EST 1977 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.323658· OSTI ID:7336499

Tolner, H

The spectral response of niobium point-contact Josephson junctions with resistance values R between 1 k..cap omega.. and 10 ..cap omega.. has been measured. For > or approx = 100 ..cap omega.. the response peaks at maxima of d/sup 2/V-bar/dI-bar/sup 2/, whereas the spectral response peaks at frequencies ..nu../sub R/< or approx = 200 GHz. After the resistance was decreased by burning-in of the contact, it was found that for underdamped contacts ..nu../sub R/is proportional to R/sup -1///sup 3/, almost independent of the junction geometry. Tapping the contact, i.e., changing the microscopic properties of the flat contact region (diameter, 5--10 ..mu..m), changed the absolute value of ..nu../sub R/. Maximum resonant response occurred approximately for critical damping at R = 80--100 ..cap omega... The observed behavior is interpreted as resonant detection at the plasma frequency. At low resistance values ..nu../sub R/ disappears, but additional resonances at ..nu.. + 150 GHz appear, some of which could be identified as antenna resonances. (AIP)

• Research Organization: Kapteyn Astronomical Institute, Department of Space Research, University of Groningen, Groningen, The Netherlands
• OSTI ID: 7336499
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 48:2; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment &amp; Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTENNAS
DAMPING
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELEMENTS
EQUIPMENT
HYSTERESIS
JOSEPHSON JUNCTIONS
METALS
NIOBIUM
PHOTOVOLTAIC EFFECT
RADIATIONS
REFRACTORY METALS
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENTS
TRAPPING