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sin(2 phi) current-phase relation in SFS junctions with decoherence in the ferromagnet | | R. Mélin
; | | Date: |
11 Jun 2004 | | Journal: | Europhys. Lett. 69, 121 (2005) | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Superconductivity | cond-mat.mes-hall cond-mat.supr-con | | Abstract: | We propose a theoretical description of the sin(2 phi) current-phase relation in SFS junctions at the 0-$pi$ 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 $l_phi$ in the absence of elastic scattering on impurities. The best fit leads to $xi simeq xi_h^{({
m diff})}/3$, where $xi_h^{({
m diff})}$ is exchange length of the diffusive system without decoherence (also equal to $xi$ in the absence of decoherence). The fit of experiments works well for the amplitude of both the sin(phi) and sin(2 phi) harmonics. | | Source: | arXiv, cond-mat/0406275 | | Services: | Forum | Review | PDF | Favorites | |
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