Reentrant ac magnetic susceptibility in Josephson-junction arrays: An alternative explanation for the paramagnetic Meissner effect
P. Barbara, F. M. Araujo-Moreira, A. B. Cawthorne, C. J. Lobb
DOI 10.1103/PhysRevB.60.7489 · Physical Review B
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Abstract
The paramagnetic Meissner effect (PME) measured in high-TC granular superconductors has been attributed to the presence of π junctions between the grains. Here we present measurements of complex ac magnetic susceptibility from two-dimensional arrays of conventional (non-π) Nb/Al/AlOx/Nb Josephson junctions. We measured the susceptibility as a function of the temperature T, the ac amplitude of the excitation field hac and the external magnetic field Hdc. The experiments show a strong paramagnetic contribution from the multijunction loops, which manifests itself as a reentrant screening at low temperature, for values of hac higher than 50 mOe. A highly simplified model, based on a single loop containing four junctions, accounts for this paramagnetic contribution and the range of parameters in which it appears. This model offers an alternative explanation of PME that does not involve π junctions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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