Non-ideal artificial phase discontinuity in long Josephson 0-kappa-junctions

Details Non-ideal artificial phase discontinuity in long Josephson 0-kappa-junctions Non-ideal artificial phase discontinuity in long Josephson 0-kappa-junctions

2004-08-10

arxiv.org/abs/cond-mat/0408214v3

Phys. Rev. B 72, 054522 (2005)

Physics

Condensed Matter

Superconductivity

Submitted to Phys. Rev. B (12 figures). v 2: refs updated, long eqs fixed v 3: major changes, fractional vortex dynamics exclu

Scientific paper

10.1103/PhysRevB.72.054522

We investigate the creation of an arbitrary $\kappa$-discontinuity of the Josephson phase in a long Nb-AlO_x-Nb Josephson junction (LJJ) using a pair of tiny current injectors, and study the formation of fractional vortices formed at this discontinuity. The current I_inj, flowing from one injector to the other, creates a phase discontinuity kappa ~ I_inj. 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-kappa-LJJ from the properties of a LJJ with an ideal kappa-discontinuity. These experimentally observed deviations in the dependence of the critical current on I_inj$ and magnetic field can be well reproduced by numerical simulation assuming a finite injector size. The physical origin of these deviations is discussed.

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