2004/08/31 by T. Gaber, E. Goldobin, A. Sterck +4
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.72.054522
published as Phys. Rev. B 72, 054522 (2005) · Submitted to Phys. Rev. B (12 figures). v 2: refs updated, long eqs fixed v 3: major changes, fractional vortex dynamics excluded
arxiv created 2005/05/20 · openalex publication_date 2005/08/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We investigate the creation of an arbitrary \ensuremathκ discontinuity of the Josephson phase in a long Nb\text\ensuremath-AlOx\text\ensuremath-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 \ensuremathκ\ensuremath∝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\ensuremath-\ensuremathκ LJJ from the properties of a LJJ with an ideal \ensuremathκ 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.