Effect of nonequilibrium phenomena in a superconducting point contact on the properties of a single-contact quantum interferometer

Journal Article · Sat Dec 31 23:00:00 EST 1983 · Sov. J. Low Temp. Phys. (Engl. Transl.); (United States)

OSTI ID:6015366

Khlus, V A

The behavior of a superconducting ring incorporating a point contact, coupled inductively to an oscillatory circuit (hf SQUID), with the rate of change of the magnetic flux in the ring being comparable to the inverse energy relaxation time of excitations in the superconductor tau/sup -1//sub epsilon/, is examined. For Tapprox.T/sub c/ the results of the microscopic theory of the nonstationary behavior of point contacts, in which the coupling between the phase difference and the current of the Josephson junction differs from the usual expression I = V/R+I/sub c/sinphi in the resistive model, are used. It is shown that the nonequilibrium behavior of a weak link for ..omega..> or approx. =tau/sub epsilon//sup -1/ significantly changes the amplitude--frequency and signal characteristics of the SQUID as compared with the case ..omega..tau/sub epsilon//sup -1/<<1, for which the results based on the resistive model are valid. The characteristics of the SQUID in the nonequilibrium situation are sensitive to the ratio between the size of the contact and the mean free path of electrons relative to scattering by impurities.

• Research Organization: Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
• OSTI ID: 6015366
• Journal Information: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States) Vol. 10:1; ISSN SJLPD
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment &amp; Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CURRENTS
ELECTRIC CONTACTS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
JOSEPHSON JUNCTIONS
JUNCTIONS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
SIGNALS
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS