title: Reentrant superconductivity in Nb/Cu1-xNix bilayers.
abstract: We report on the first observation of a pronounced reentrant superconductivity phenomenon in a superconductor/ferromagnet layered system. The results were obtained using a superconductor/ferromagnetic-alloy bilayer of Nb/Cu(1-x)Ni(x). The superconducting transition temperature T(c) drops sharply with increasing thickness dCuNi) of the ferromagnetic layer, until complete suppression of superconductivity is observed at d(CuNi) approximately equal to 4 nm. Increasing the Cu(1-x)Ni(x) layer thickness further, superconductivity reappears at d(CuNi) > or =13 nm. Our experiments give evidence for the pairing function oscillations associated with a realization of the quasi-one-dimensional Fulde-Ferrell-Larkin-Ovchinnikov-like state in the ferromagnetic layer.
authors.affiliation: Institute of Applied Physics, LISES ASM, Kishinev 2028, Moldova.
authors.forename: V
authors.initials: V
authors.lastname: Zdravkov
authors.forename: A
authors.initials: A
authors.lastname: Sidorenko
authors.forename: G
authors.initials: G
authors.lastname: Obermeier
authors.forename: S
authors.initials: S
authors.lastname: Gsell
authors.forename: M
authors.initials: M
authors.lastname: Schreck
authors.forename: C
authors.initials: C
authors.lastname: Müller
authors.forename: S
authors.initials: S
authors.lastname: Horn
authors.forename: R
authors.initials: R
authors.lastname: Tidecks
authors.forename: L R
authors.initials: LR
authors.lastname: Tagirov