Multicritical behavior of the phase diagrams of ferromagnet/superconductor layered structures |
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Authors: | Yu A Izyumov Yu N Proshin M G Khusainov |
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Institution: | (1) Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620219, Russia;(2) Kazan State University, ul. Lenina 18, Kazan, 420008 Tatarstan, Russia;(3) Kazan State Technical University, Vostok Branch, Chistopol’, 422950 Tatarstan, Russia |
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Abstract: | For ferromagnet/superconductor (F/S) layered structures, new 3D Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) states are predicted. In most cases, these states are characterized by a higher critical temperature T c than the known 1D LOFF states. It is shown that the nonmonotonic behavior of T c is determined by the oscillations of the Cooper pair flux through the F/S boundary, which occur as a result of the 3D-1D-3D phase transitions at the Lifshits triple points. The appearance of the new 3D LOFF states and the presence of nonmagnetic impurities leads to a strong damping of the 1D oscillations of the LOFF pair amplitude and to a considerable smoothing of the dependence of T c on the F layer thickness d f . An interpretation of the behavior of the experimental dependences T c (d f ) obtained for F/S structures is proposed. |
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