Dispersive-mode theory for the high-temperature rf superconducting quantum interference device
Chang-xin Fan
DOI 10.1103/PhysRevB.41.2041 · Physical Review B
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Abstract
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 Le, Le=k2FLT, where k is the coupling coefficient between the SQUID ring and the resonant tank circuit with inductance LT, and F is a periodic function of external flux Φdc with a period of flux quantum Φ0. 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 λe, can be interpreted. The theory is qualitatively consistent with available experimental results.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
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