Ferromagnetic proximity effect in a ferromagnet/iron-pnictide superconductor junction
Ferromagnetic proximity effect in a ferromagnet/iron-pnictide superconductor junction
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DOI：
10.1209/0295-5075/96/17009
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发表时间：
2011-10
期刊：
影响因子：
--
通讯作者：
Y. Tao;Jingguo Hu
中科院分区：
文献类型：
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作者：
Y. Tao;Jingguo Hu
利用Nambu旋量绿色函数方法，首次研究了由铁磁体（FM）和铁磷族化合物超导体（SC）组成的反相s波对双层膜中的邻近效应.由于SC中两对势的符号相反，邻近效应引起的界面处FM区和SC区的序参量不仅不连续而且反相，势垒强度对两区的感生超导态密度（DOS）的峰谷行为有显著影响.特别地，在SC的任一能隙处出现了一个明显的DOS特征峰。这些性质与无反相s波配对的SC有很大的不同，可以应用于铁基SC中反相s波配对的实验识别。
The proximity effect in a bilayer consisting of a ferromagnet (FM) and an iron-pnictide superconductor (SC) with antiphase s-wave pairing is first studied by extending Nambu spinor Green's function approach. Due to the opposite signs of the two pair potentials in the SC, the order parameters in the FM and SC regions at the interface induced by the proximity effect are not only noncontinuous but also antiphase and the barrier strength has a significant influence on the peak and dip behaviors of the induced superconducting density of states (DOS) in the two regions. Particularly, one conspicuously characteristic peak of the DOS at either gap energy in the SC appears. These properties are much different from those without antiphase s-wave pairing for the SC, which can be applied to experimentally identify the antiphase s-wave pairing in iron-based SCs.