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SM ISO690:2012 LENK, D., HEMMIDA, Mamoun, MORARI, Roman, ZDRAVKOV, Vladimir, ULLRICH, Aladin, MULLER, Claus, SIDORENKO, Anatolie, HÖRN, Siegfried, TAGIROV, Lenar, LOIDL, Alois, KRUG VON NIDDA, Hans Albrecht, TIDECKS, Reinhard. Influence of the FFLO-like state on the upper critical field of a superconductor/ferromagnet bilayer: Angular and temperature dependence. In: Physical Review B, 2016, vol. 93, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.93.184501 |
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Physical Review B | |
Volumul 93 / 2016 / ISSN 2469-9950 /ISSNe 2469-9969 | |
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DOI:https://doi.org/10.1103/PhysRevB.93.184501 | |
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We investigated the upper critical magnetic field Hc of a superconductor-ferromagnet (S/F) bilayer of Nb/Cu41Ni59 and a Nb film (as reference). We obtained the dependence of Hc and Hc (perpendicular and parallel to the film plane, respectively) on the temperature T by measurements of the resistive transitions and the dependence on the inclination angle θ of the applied field to the film plane, by nonresonant microwave absorption. Over a wide range, Hc and Hc show the temperature dependence predicted by the Ginzburg-Landau theory. At low temperatures and close to the critical temperature, deviations are observed. While Hc(θ) of the Nb film follows the Tinkham prediction for thin superconducting films, the Nb/Cu41Ni59-bilayer data exhibit deviations when θ approaches zero. We attribute this finding to the additional anisotropy induced by the quasi-one-dimensional Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-like state and propose a new vortex structure in S/F bilayers, adopting the segmentation approach from high-temperature superconductors. |
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Cuvinte-cheie High temperature superconductors, Superconducting films |
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