Mesoscopic effects in superconductor-ferromagnet-super- conductor junctions
A. F. Ioffe Physical-Technical Institute - 194021 St. Petersburg, Russia
2 Physics Department, University of Washington - Seattle, WA 98195, USA
Accepted: 4 February 2003
We show that at zero temperature the supercurrent through the superconductor–ferromagnetic-metal–superconductor (SFS) 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 .
PACS: 74.78.Fk – Multilayers, superlattices and heterostructures / 74.78.Na – Mesoscopic and nanoscale systems
© EDP Sciences, 2003