Nonideal artificial phase discontinuity in long Josephson 0−κ junctions
T. Gaber, E. Goldobin, A. Sterck, R. Kleiner, D. Koelle, M. Siegel, M. Neuhaus
DOI 10.1103/PhysRevB.72.054522 · Physical Review B
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Abstract
We investigate the creation of an arbitrary κ discontinuity of the Josephson phase in a long Nb−AlOx−Nb Josephson junction (LJJ) using a pair of tiny current injectors, and study the formation of fractional vortices formed at this discontinuity. The current Iinj, flowing from one injector to the other, creates a phase discontinuity κ∝Iinj. The calibration of injectors is discussed in detail. The small but finite size of injectors leads to some deviations of the properties of such a 0−κ LJJ from the properties of a LJJ with an ideal κ discontinuity. These experimentally observed deviations in the dependence of the critical current on Iinj and magnetic field can be well reproduced by numerical simulation assuming a finite injector size. The physical origin of these deviations is discussed.
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. | 9.2 | Pressure not reported | unknown |
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