Screening properties of multiply connected ferromagnet-superconductor hybrid structures
Screening properties of multiply connected ferromagnet-superconductor hybrid structures
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DOI：
10.1134/s106377611707010x
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发表时间：
2017-08-01
影响因子：
1.1
通讯作者：
Samokhvalov, A. V.
中科院分区：
文献类型：
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作者：
Samokhvalov, A. V.
基于线性化的Usadel方程，分析了由空心超导（S）圆柱（壳）和中心填充铁磁（F）金属（芯）组成的铁磁/超导（SF）混合结构的超导相变温度T（c）。结果表明，S和F金属间的邻近效应以及交换作用可以诱导出具有Δ exp（iL θ + ipz）的非均匀超导态，其特征是相位L和波数p沿柱轴的非零循环，描述了L-O-Fulde-Ferrell（LOFF）不稳定性沿着的演化.研究了不同L和p值的状态之间的转变，以及超导转变温度T（c）和磁场进入SF结构的有效穿透深度I >对铁磁区特征尺寸的非单调依赖关系。
Superconducting phase transition temperature T (c) of a ferromagnet/superconductor (SF) hybrid structure consisting of a hollow superconducting (S) cylinder (shell) with the central part (core) filled with a ferromagnetic (F) metal has been analyzed on the basis of linearized Usadel equations. It has been shown that the proximity effect between the S and F metals, as well as the exchange interaction, may induce an inhomogeneous superconducting state with Delta exp(iL theta + ipz), which is characterized by nonzero circulation of phase L and wavenumber p describing the Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) instability along the cylinder axis. The transitions between the states with different values of L and p, which are accompanied by a nonmonotonic dependence of superconducting transition temperature T (c) and effective magnetic field penetration depth I > into the SF structure on the characteristic size of the ferromagnetic region, have been investigated.