Dynamics of semifluxons in Nb long Josephson 0-pi junctions

Details Dynamics of semifluxons in Nb long Josephson 0-pi junctions Dynamics of semifluxons in Nb long Josephson 0-pi junctions

2003-11-26

arxiv.org/abs/cond-mat/0311610v1

Phys. Rev. Lett. 92, 057005 (2004)

Physics

Condensed Matter

Superconductivity

Fractional vortices in conventional superconductors ;-)

Scientific paper

10.1103/PhysRevLett.92.057005

We propose, implement and test experimentally long Josephson 0-pi junctions fabricated using conventional Nb-AlOx-Nb technology. We show that using a pair of current injectors, one can create an arbitrary discontinuity of the Josephson phase and in particular a pi-discontinuity, just like in d-wave/s-wave or in d-wave/d-wave junctions, and study fractional Josephson vortices which spontaneously appear. Moreover, using such junctions, we can investigate the \emph{dynamics} of the fractional vortices -- a domain which is not yet available for natural 0-pi-junctions due to their inherently high damping. We observe half-integer zero-field steps which appear on the current-voltage characteristics due to hopping of semifluxons.

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