sin(2 phi) current-phase relation in SFS junctions with decoherence in the ferromagnet
| dc.creator | Mélin, R. | |
| dc.date | 2004-06-11 | |
| dc.date | 2004-08-27 | |
| dc.date.accessioned | 2026-07-07T06:33:47Z | |
| dc.date.available | 2026-07-07T06:33:47Z | |
| dc.description | We propose a theoretical description of the sin(2 phi) current-phase relation in SFS junctions at the 0-$π$ cross-over obtained in recent experiments by Sellier et al. [Phys. Rev. Lett. 92, 257005 (2004)] where it was suggested that a strong decoherence in the magnetic alloy can explain the magnitude of the residual supercurrent at the 0-pi cross-over. To describe the interplay between decoherence and elastic scattering in the ferromagnet we use an analogy with crossed Andreev reflection in the presence of disorder. The supercurrent as a function of the length R of the ferromagnet decays exponentially over a length xi, larger than the elastic scattering length $l_d$ in the absence of decoherence, and smaller than the coherence length $l_ϕ$ in the absence of elastic scattering on impurities. The best fit leads to $ξ\simeq ξ_h^{({\rm diff})}/3$, where $ξ_h^{({\rm diff})}$ is exchange length of the diffusive system without decoherence (also equal to $ξ$ in the absence of decoherence). The fit of experiments works well for the amplitude of both the sin(phi) and sin(2 phi) harmonics. | |
| dc.description | 7 pages, 3 figures, article rewritten | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0406275 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0406275 | |
| dc.identifier | Europhys. Lett. 69, 121 (2005) | |
| dc.identifier | doi:10.1209/epl/i2004-10303-6 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/99312 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.subject | Superconductivity | |
| dc.title | sin(2 phi) current-phase relation in SFS junctions with decoherence in the ferromagnet | |
| dc.type | text |