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In order to clarify the influence of ferromagnetism on superconductivitythrough a normal metal layer, the superconducting properties of epitaxialNb(110)/Au(111)/Fe(110) trilayers were studied as a function of the thicknesstAu of the intervening Au layer. Structural characterization of the samplesrevealed sharp interfaces, almost free from roughness. A strong suppression ofthe superconducting transition temperature Tc was observed for tAu<10 A,implying a strong spin-polarization of the Au layer in the vicinity of theAu/Fe interface. A periodic change of Tc with a period of ~21 A (~9 atomicmonolayer of Au) was observed for 20 A<tAu<104 A. Neither the Fermi surfacenesting of the normal metal layer, nor Fulde-Ferrel-Larkin-Ovchinnikovoscillations induced by a superconducting proximity effect in the ferromagnetcan by themselves account for the observed period. These results suggest that anew and more subtle form of quantum interference occurs in very clean trilayersystems.Comment: 15 pages, 6 figure

physical review. b, condensed matter and materials physics

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Interplay between superconductivity and ferromagnetism in epitaxialNb(110)∕Au(111)∕Fe(…