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Phase transitions in hybrid SFS structures with thin superconducting layers

  • Superconductivity
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Abstract

Calculations of critical temperature T c of the phase transition to superconducting state of a superconductor/ ferromagnet/superconductor (SFS) hybrid structure with proximity effect is performed on the base of linearized Usadel equations. It is shown that the proximity effect between S and F metals and the exchange interaction can induce an inhomogeneous superconducting state with longitudinal to layers Δ ∝ exp(ipz) modulation of the superconductivity order parameter, which is characterized by nonzero value of the wave number p, describing the Larkin–Ovchinnikov–Fulde–Ferrell instability. Influence of this instability on transitions between 0- and π-states of the SFS structure is studied. It is shown that the 0–π transition is accompanied by a nonmonotonic dependence of both the critical temperature T c and the effective penetration depth Λ of the magnetic field into the hybrid structure on the characteristic size of the ferromagnetic region.

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Authors and Affiliations

  1. Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, 603950, Russia

    A. V. Samokhvalov

  2. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603950, Russia

    A. V. Samokhvalov

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  1. A. V. Samokhvalov
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Correspondence to A. V. Samokhvalov.

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Original Russian Text © A.V. Samokhvalov, 2017, published in Fizika Tverdogo Tela, 2017, Vol. 59, No. 11, pp. 2123–2129.

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Samokhvalov, A.V. Phase transitions in hybrid SFS structures with thin superconducting layers. Phys. Solid State 59, 2143–2149 (2017). https://doi.org/10.1134/S1063783417110270

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