Mesoscopic effects in superconductor-ferromagnet-superconductor junctions

Abstract

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 $\pm \pi /2$.

4 pages, 1 figure

References in corpus (3)

• Josephson current in superconductor-ferromagnet structures with a nonhomogeneous magnetization
• $\pi -0$ Transition in Superconductor-Ferromagnetic-Superconductor Junctions
• Feromagnetic "$\pi$"-junctions

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• Odd-frequency Pairs and Josephson Current through a Strong Ferromagnet
• Josephson effect in double-barrier superconductor-ferromagnet junctions
• Supercurrent in Long SFFS Junctions with Antiparallel Domain Configuration
• Layered ferromagnet-superconductor structures: the $\pi$ state and proximity effects
• Oscillatory eigenmodes and stability of one and two arbitrary fractional vortices in long Josephson 0-kappa-junctions
• Mesoscopic fluctuations of the supercurrent in diffusive Josephson junctions
• Theory of fractional vortex escape in a 0-kappa long Josephson junction
• Giant Mesoscopic Fluctuations and Long Range Superconducting Correlations in Superconductor--Ferromagnet structures
• Cooper pair splitting in diffusive magnetic SQUIDs
• Mesoscopic supercurrent fluctuations in diffusive magnetic Josephson junctions