Depinning of caged interstitial vortices in superconducting a- WGe films with an antidot lattice
E. Rosseel, M. Van Bael, M. Baert, R. Jonckheere, V. V. Moshchalkov, Y. Bruynseraede
DOI 10.1103/PhysRevB.53.R2983 · Physical Review B
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Abstract
The magnetoresistance, critical currents, and voltage-current (V−I) characteristics have been studied in superconducting a-WGe films with a square lattice of cylindrical microholes (antidots). Besides a strong enhancement of the critical current caused by matching of the flux lines with the antidot lattice having a period d, two different dissipative regimes have been observed giving rise to a crossover in the [log(V)−log(I)] characteristics for magnetic fields above the first matching field B1=Bφ≡Φ0d−2. This V−I behavior is caused by the coexistence of a weakly pinned interstitial vortex fluid and a strongly pinned vortex lattice at the antidots.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| W0.67Ge0.33 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.725 | Pressure not reported | midpoint |
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