The 0 and the pi phase Josephson coupling through an insulating barrier with magnetic impurities
Vavra, O. · Gazi, S. · Golubovic, D. S. · Vavra, I. · Derer, J. · Verbeeck, J. · Van Tendeloo, G. · Moshchalkov, V. V.
Original · EN
We have studied temperature and field dependencies of the critical current IC in the Nb-Fe₀.₁Si₀.₉-Nb Josephson junction with tunneling barrier formed by paramagnetic insulator. We demonstrate that in these junctions the co-existence of both the 0 and the π states within one tunnel junction takes place which leads to the appearance of a sharp cusp in the temperature dependence IC(T) similar to the IC(T) cusp found for the 0-π transition in metallic π junctions. This cusp is not related to the 0-π temperature induced transition itself, but is caused by the different temperature dependencies of the opposing 0 and π supercurrents through the barrier.
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