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We study the superconducting properties of a series of Fe/V/Fe trilayers with variable thickness of the Fe layer and constant thickness of the V layer. For an optimized combination of thicknesses and structural quality of the thin films we observe a re-entrant behavior of the superconducting state when plotting the superconducting transition temperature Tc as a function of the Fe thickness dFe. With increasing dFe, Tc drops sharply up to dFe8 , then the superconductivity disappears, and it restores again at dFe>~12 .
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Гарифуллин et al. (2002) studied this question.
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