Origin of nonmonotonic Tc behavior in ferromagnet/superconductor structures

The original theory of proximity effect in the layered ferromagnetic metal/superconductor (FM/S) structures taking into account a finite transparency of FM/S interface as well as a competition between 1D and 3D Larkin–Ovchinnikov–Fulde–Ferrell (LOFF) states is developed. It is shown that the oscilla...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2000, Vol.284, p.503-504
Main Authors: Khusainov, Mansur, Izyumov, Yurii A., Proshin, Yurii N.
Format: Article
Language:English
Subjects:
Ferromagnet/superconductor layered structures
Proximity effects
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Summary:The original theory of proximity effect in the layered ferromagnetic metal/superconductor (FM/S) structures taking into account a finite transparency of FM/S interface as well as a competition between 1D and 3D Larkin–Ovchinnikov–Fulde–Ferrell (LOFF) states is developed. It is shown that the oscillatory dependence of critical temperature T c on the FM layer thickness d f is due to oscillations of the Cooper pairs flux at the FM/S boundary. This effect is possible not only in the FM/S multilayers, but in the FM/S bilayers as well. The phenomena of reentrant and periodically reentrant superconductivity in the FM/S bilayers and superlattices are predicted. The competition between 1D and 3D LOFF states leads to significant smoothing of the T c( d f) dependence, so that in the most cases one maximum of this dependence is realized as this has been observed in Gd/Nb and Fe/Nb/Fe.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(99)02095-5