Dispersive-mode theory for the high-temperature rf superconducting quantum interference device

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.2041· OSTI ID:6909207

Fan, C ^[1]

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1. Department of Physics, Fudan University, Shanghai, People's Republic of China (CN)

Based on the hypothesis that the macroscopic superconducting shielding current on the surface of a porous granular superconductor is short lived due to the action of thermal noise, a dispersive-mode theory for a high-temperature radio-frequency superconducting quantum interference device (rf SQUID) is suggested. In this theory, the effect of the SQUID ring on the resonant tank circuit is an effective inductance {ital L}{sub {ital e}}, {ital L}{sub {ital e}}=k{sup 2}FL{sub T}, where {ital k} is the coupling coefficient between the SQUID ring and the resonant tank circuit with inductance {ital L}{sub {ital T}}, and {ital F} is a periodic function of external flux {Phi}{sub dc} with a period of flux quantum {Phi}{sub 0}. The phenomena that the weak-link-rf-SQUID flux-receiving area defined by the hole of the SQUID ring and the bulk-rf-SQUID flux-receiving area, which is determined by an annular surface region with a thickness of the effective penetration depth {lambda}{sub {ital e}}, can be interpreted. The theory is qualitatively consistent with available experimental results.

• OSTI ID: 6909207
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:4; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COUPLING
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
LIFETIME
MAGNETIC FLUX
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NOISE
PENETRATION DEPTH
RINGS
SQUID DEVICES
SUPERCONDUCTING DEVICES
TANK CIRCUITS
TEMPERATURE NOISE