Abstract
The electric field within the double electric layer that occurs when two conductors with different work functions come into contact induces interface spin-orbit coupling. In the case of contact of a conventional, s-wave superconductor with a ferromagnetic metal, the coupling is predicted to give rise to the appearance of triplet superconductivity on both sides of the interface. The form of the triplet component of the condensation amplitude is determined, and the ability of the triplet superconductivity to penetrate into the ferromagnet on the usual coherence length is shown.
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It should be mentioned that the triplet superconductivity on the F side of the F/S interface was also considered in the article by F. S. Bergeret, A. F. Volkov, and K. B. Efetov [Phys. Rev. Lett. 86, 4096 (2001)] as a result of the magnetization rotation near the interface like that in the Bloch domain wall. In addition to the difference between models studied in the present and that paper, there is a fundamental difference between approaches applied. In that paper, the Usadel equation for the anomalous Green’s matrix-function (AGF) as a function of the Cooper pair center of mass coordinates was solved. The antisymmetric components of the AGF were, as usually, attributed to the singlet superconductivity whereas the symmetric ones were interpreted as the appearance of the triplet superconductivity. However, the total AGF, F(r 1, r 2)αβ (as well as its singlet and triplet parts separately) must change sign at (α, r 1) ⇄ (β, r 2) due to the Pauli principle. It is unclear how one can assure this property for the symmetric component found within the Usadel approach, i.e., without a consideration of the relative coordinate dependence of the AGF.
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From Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 77, No. 4, 2003, pp. 212–216.
Original English Text Copyright © 2003 by Edelstein.
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Edelstein, V.M. Influence of an interface double electric layer on the superconducting proximity effect in ferromagnetic metals. Jetp Lett. 77, 182–186 (2003). https://doi.org/10.1134/1.1571878
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DOI: https://doi.org/10.1134/1.1571878