Long-range spin-singlet proximity effect for a Josephson system with a single-crystal ferromagnet due to its band-structure features
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), 10.1038/nphys1621] 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.
- Publication:
-
Physical Review B
- Pub Date:
- March 2018
- DOI:
- 10.1103/PhysRevB.97.100502
- arXiv:
- arXiv:1709.06646
- Bibcode:
- 2018PhRvB..97j0502A
- Keywords:
-
- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 2 figures