Physics – Condensed Matter – Superconductivity
Scientific paper
2006-06-20
Phys. Rev. B 74, 020502 (2006)
Physics
Condensed Matter
Superconductivity
Accepted in Physical Review B
Scientific paper
10.1103/PhysRevB.74.020502
We have studied temperature and field dependencies of the critical current $I_{C}$ in the Nb-Fe$_{0.1}$Si$_{0.9}$-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 $\pi$ states within one tunnel junction takes place which leads to the appearance of a sharp cusp in the temperature dependence $I_{C}(T)$ similar to the $I_{C}(T)$ cusp found for the $0-\pi$ transition in metallic $\pi$ junctions. This cusp is not related to the $0-\pi$ temperature induced transition itself, but is caused by the different temperature dependencies of the opposing 0 and $\pi$ supercurrents through the barrier.
Derer J.
Gazi S.
Golubovic D. S.
Moshchalkov Victor V.
Tendeloo Gustaaf Van
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