F/S/F三层中类FFLO态的临界温度振荡和重入超导性
Critical Temperature Oscillations and Reentrant Superconductivity due to the FFLO like State in F/S/F Trilayers
摘要：
铁磁体/超导体/铁磁体（F/S/F）三层结构构成了超导自旋阀的核心，其中类Fulde-Ferrell Larkin-Ovchinnikov（FFLO）态的建立导致了超导对波函数的干涉效应。在这样的三层中实现强临界温度振荡，作为铁磁层厚度的函数，或者甚至更有效地，重入超导性，是获得大自旋阀效应的关键条件，即临界温度的大偏移。这两种现象已实现实验中的Cu 41 Ni 59/Nb/Cu 41 Ni 59三层在本工作中研究。
英文摘要：
Ferromagnet/Superconductor/Ferromagnet (F/S/F) trilayers, in which the establishing of a Fulde-Ferrell Larkin-Ovchinnikov (FFLO) like state leads to interference effects of the superconducting pairing wave function, form the core of the superconducting spin valve. The realization of strong critical temperature oscillations in such trilayers, as a function of the ferromagnetic layer thicknesses or, even more efficient, reentrant superconductivity, are the key condition to obtain a large spin valve effect, i.e. a large shift in the critical temperature. Both phenomena have been realized experimentally in the Cu 41 Ni 59 /Nb/Cu 41 Ni 59 trilayers investigated in the present work.
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