Spin-flip scattering and critical currents in ballistic half-metallic d-wave Josephson junctions
| Autor: | Enoksen, Henrik, Linder, Jacob, Sudbo, Asle |
|---|---|
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 85, 014512 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.85.014512 |
| Popis: | We analyze the dc Josephson effect in a ballistic superconductor/half-metal/superconductor junction by means of the Bogoliubov de Gennes equations. We study the role of spin-active interfaces and compare how different superconductor symmetries, including d-wave pairing, affect the Josephson current. We analyze the critical current as a function of junction width, temperature, and spin-flip strength and direction. In particular, we demonstrate that the temperature dependence of the supercurrent in the dxy symmetry case differs qualitatively from the s and dx2-y2 symmetries. Moreover, we have derived a general analytical expression for the Andreev bound-state energies that shows how one can either induce 0-{\pi} transitions or continuously change the ground-state phase of the junction by controlling the magnetic misalignment at the interfaces. Comment: 7 pages, 7 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|