Onset of flux-bundle migration into superconducting niobium strips
Vincent Jeudy, Denis Limagne
DOI 10.1103/PhysRevB.60.9720 · Physical Review B
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Abstract
Penetration of magnetic flux into type-II superconducting Nb strips is observed by a flux jump readout technique. To investigate the effect of the geometry, strips of different width are subjected to an increasing perpendicular magnetic field. We demonstrate that conventional geometrical barrier models cannot account for the onset of the flux migration into the strip volume. The migration starts for a local magnetic field at the strip equator higher than Hc1, allowing the irreversible penetration of the mixed state on the edges. The flux entry consists of flux bundles, each of them containing several hundreds of flux quanta.
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. | 4.2 | Pressure not reported | unknown |
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