Mesoscopic effects in superconductor-ferromagnet-superconductor junctions

Details Mesoscopic effects in superconductor-ferromagnet-superconductor junctions Mesoscopic effects in superconductor-ferromagnet-superconductor junctions

2002-04-05

arxiv.org/abs/cond-mat/0204123v1

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure

Scientific paper

10.1209/epl/i2003-00367-8

We show that at zero temperature the supercurrent through the superconductor - ferromagnetic metal - superconductor junctions does not decay exponentially with the thickness $L$ of the junction. At large $L$ it has a random sample-specific sign which can change with a change in temperature. In the case of mesoscopic junctions the phase of the order parameter in the ground state is a random sample-specific quantity. In the case of junctions of large area the ground state phase difference is $\pm \pi/2$.

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