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19 April 2024 |
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Nonsinusoidal current-phase relations and the $0-pi$ transition in diffusive ferromagnetic Josephson junctions | | G. Mohammadkhani
; M. Zareyan
; | | Date: |
6 Apr 2006 | | Journal: | Phys. Rev. B 73, 134503 (2006) | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Superconductivity | | Abstract: | We study the effect of the interfacial transparency on the Josephson current in a diffusive ferromagnetic contact between two superconductors. In contrast to the cases of the fully transparent and the low-transparency interfaces, the current-phase relation is shown to be nonsinusoidal for a finite transparency. It is demonstrated that even for the nearly fully transparent interfaces the small corrections due to weak interfacial disorders contribute a small second-harmonic component in the current-phase relation. For a certain thicknesses of the ferromagnetic contact and the exchange field this can lead to a tiny minimum supercurrent at the crossover between 0 and $pi$ states of the junction. Our theory has a satisfactory agreement with the recent experiments in which a finite supercurrent was observed at the transition temperature. We further explain the possibility for observation of a large residual supercurrent if the interfaces have an intermediate transparency. | | Source: | arXiv, cond-mat/0604178 | | Services: | Forum | Review | PDF | Favorites | |
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