Flux pinning in large Josephson junctions with columnar defects
M. A. Itzler, M. Tinkham
DOI 10.1103/PhysRevB.51.435 · Physical Review B
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Abstract
We have studied flux pinning by a periodic array of columnar defects in a two-dimensional geometry using large Josephson junctions with lithographically patterned defects in the junction barrier. The field-dependent critical current Ic(H) exhibits enhancement to values of order Ic0==Ic(H=0) at commensurate fields for which the number of flux quanta in the junction is an integral multiple of the number of defects, and we model this behavior by considering the blocking of Josephson currents by the defects. Current-voltage characteristics taken near the commensurate fields reveal junction dynamics analogous to those found near zero field: at the commensurate fields, we find ‘‘commensurate field steps’’ arising from fluxon propagation previously seen only at zero field, and as the field is increased or decreased from a commensurate value, the evolution of the current-voltage characteristics closely resembles that found near zero field.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb/AlOx/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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