Phenomenological model of the nonlinear microwave response of a superconductor containing weak links
Anton V. Velichko, Adrian Porch
DOI 10.1103/PhysRevB.63.094512 · Physical Review B
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Abstract
A phenomenological model is proposed which describes the effect of both dc and rf magnetic fields H on the microwave surface impedance, Zs=Rs+jXs, of a superconductor containing weak links. Two types of the weak links are considered; a weak link between two grains, shunted by another grain, and a nonshunted weak link. In both cases, the dependences of Rs and Xs on applied H were found to be anomalous. Under certain conditions, the values of Zs(H) can fall below the zero-field values. Comparison with experiment is performed, and very good qualitative and (in some cases) quantitative agreement is found.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87 | Pressure not reported | unknown |
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