Long-Range Spin-Singlet Proximity Effect For A Josephson System With A Single-Crystal Ferromagnet Due To Its Band-Structure Features
Physical Review B(2018)
Abstract
A possible explanation for the long-range proximity effect observed in single-crystalline cobalt nanowires sandwiched between two tungsten superconducting electrodes [Nat. Phys. 6, 389 (2010)] is proposed. The theoretical model uses properties of a ferromagnet band structure. Specifically, to connect the exchange field with the momentum of quasiparticles the distinction between the effective masses in majority and minority spin subbands and the Fermi-surface anisotropy are considered. The derived Eilenberger-like equations allowed us to obtain a renormalized exchange interaction that is completely compensated for some crystallographic directions under certain conditions. The proposed theoretical model is compared with previous approaches.
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Key words
Ferromagnet Structures,Proximity Effects,Spin-Orbit Coupling
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