Paramagnetic Meissner effect in multiply-connected superconductors
A. P. Nielsen, A. B. Cawthorne, P. Barbara, F. C. Wellstood, C. J. Lobb, R. S. Newrock, M. G. Forrester
DOI 10.1103/PhysRevB.62.14380 · Physical Review B
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Abstract
We have measured a paramagnetic Meissner effect in Nb–Al2O3–Nb Josephson-junction arrays using a scanning superconducting quantum interference device microscope. The arrays exhibit diamagnetism for some cooling fields and paramagnetism for other cooling fields. The measured mean magnetization is always small, 〈Φtot−Φext〉<0.3Φ0 (in terms of flux per unit cell of the array, where Φ0 is the flux quantum), for the range of cooling fields investigated (−12Φ0 to 12Φ0). We demonstrate that a different model of magnetic screening, valid for multiply-connected superconductors, reproduces all of the essential features of paramagnetism that we observe and that no exotic mechanism, such as d-wave superconductivity, is needed for paramagnetism.
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 |
| Bi2Sr2CaCu2O8 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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