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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2015

First order 0-pi phase transitions in superconductor/ferromagnet/superconductor trilayers

Résumé

We study the thermodynamics of the diffusive SFS trilayer composed of thin superconductor (S) and ferromagnet (F) layers. On the basis the self-consistent solutions of nonlinear Usadel equations in the F and S layers we obtain the Ginzburg--Landau expansion and compute the condensation free energy and entropy of the $0$ (even) and $\pi$ (odd) order parameter configurations. The first order $0-\pi$ transition as a function of temperature $T$ occurs, which is responsible for a jump of the averaged magnetic field penetration depth $\lambda(T)$ recently observed on experiments [N.Pompeo, et. al., Phys. Rev. B 90, 064510 (2014)]. The generalized Ginzburg-Landau functional was proposed to describe SFS trilayer for arbitrary phase difference between the superconducting order parameters in the S layers. The temperature dependence of the SFS Josephson junction critical current demonstrates the strong anharmonicity of the corresponding current--phase relation in the vicinity of the $0-\pi$ transition. In rf SQUID, coexistence of stable and metastable $0$ and $\pi$ states provides integer and half--integer fluxoid configurations.
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hal-01216388 , version 1 (16-10-2015)

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A. V. Samokhvalov, Alexandre I. Buzdin. First order 0-pi phase transitions in superconductor/ferromagnet/superconductor trilayers. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (5), pp.054511 (1-11). ⟨10.1103/PhysRevB.92.054511⟩. ⟨hal-01216388⟩

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