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We propose, implement and test experimentally long Josephson 0-pi junctionsfabricated using conventional Nb-AlOx-Nb technology. We show that using a pairof current injectors, one can create an arbitrary discontinuity of theJosephson phase and in particular a pi-discontinuity, just like ind-wave/s-wave or in d-wave/d-wave junctions, and study fractional Josephsonvortices which spontaneously appear. Moreover, using such junctions, we caninvestigate the \emph{dynamics} of the fractional vortices -- a domain which isnot yet available for natural 0-pi-junctions due to their inherently highdamping. We observe half-integer zero-field steps which appear on thecurrent-voltage characteristics due to hopping of semifluxons.Comment: Fractional vortices in conventional superconductors ;-

physical review letters

Dynamics of Semifluxons in Nb Long Josephson<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>0</mml:mn><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>π</mml:mi></mml:math>Junctions

Dynamics of Semifluxons in Nb Long Josephson0−πJunctions