Reentrant ac Magnetic Susceptibility in Josephson-Junction Arrays
F. M. Araujo-Moreira, P. Barbara, A. B. Cawthorne, C. J. Lobb
DOI 10.1103/PhysRevLett.78.4625 · Physical Review Letters
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Abstract
We have measured the complex ac magnetic susceptibility of unshunted Josephson-junction arrays as a function of temperature T, amplitude of the excitation field hac, and external magnetic field Hdc. For small hac Meissner screening occurs. For larger hac, however, the screening is reentrant in T. This reentrance is not thermodynamic but dynamic and arises from the paramagnetic contribution of multijunction loops. This result gives an alternative explanation of the paramagnetic Meissner effect observed in granular superconductors. Experimental results are in agreement with a simplified model based on a single loop containing four 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. | 9.2 | Pressure not reported | onset |
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