Reentrant superconductivity in superconductor/ferromagnetic-alloy bilayers
Reentrant superconductivity in superconductor/ferromagnetic-alloy bilayers
复制标题
超导体/铁磁合金双层中的重入超导性
DOI：
10.1103/physrevb.82.054517
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发表时间：
2010
影响因子：
3.7
通讯作者：
L. Tagirov
中科院分区：
文献类型：
--
作者：
V. Zdravkov;J. Kehrle;G. Obermeier;S. Gsell;Matthias Schreck;C. Müller;H. V. Nidda;Jörg K. N. Lindner;J. Moosburger‐Will;E. Nold;R. Morari;Vladimir Ryazanov;Anatolie Sidorenko;Siegfried Horn;R. Tidecks;L. Tagirov
本文观察了铌和铁磁合金Cu_（41）Ni_（59）双层膜中的超导电性振荡行为。这种现象在Nb层厚度约为7.3 nm时最为明显：超导转变温度Tc首先随着铁磁合金厚度的增加而急剧下降，以在铁磁合金厚度dCuNi ≈ 4 nm时完全抑制超导电性。随着dCuNi厚度的进一步增加，当dCuNi ≥ 13 nm时，超导电性得到恢复。Nb/Cu_（41）Ni_（59）双层膜中的这种强非单调和重入的超导电性是由于铁磁合金中类似于准一维Fulde-Ferrell-Larkin-Ovchinnikov态的状态的实现。
Oscillating behavior of superconductivity in ultrathin bilayers of niobium and ferromagnetic alloy Cu41Ni59 has been observed. This phenomenon was most pronounced at a Nb layer thickness of about 7.3 nm: the superconducting transition temperature Tc first sharply decreased with an increase in the ferromagnetic alloy thickness to complete suppression of superconductivity at the ferromagnetic alloy thickness dCuNi ≈ 4 nm. With a further increase in the thickness dCuNi, the superconductivity was restored at dCuNi ≥ 13 nm. This strongly nonmonotonic and reentrant behavior of superconductivity in Nb/Cu41Ni59 bilayers is attributed to implementation of a state in the ferromagnetic alloy that is similar to the quasi-one-dimensional Fulde-Ferrell-Larkin-Ovchinnikov state.