Proximity effects in a spin-triplet superconductor–ferromagnet heterostucture with a spin-active interface
Proximity effects in a spin-triplet superconductor–ferromagnet heterostucture with a spin-active interface
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具有自旋活性界面的自旋三重态超导体-铁磁体异质结构中的邻近效应
DOI：
10.1103/physrevb.88.054516
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发表时间：
2012
影响因子：
3.7
通讯作者：
D. Manske
中科院分区：
文献类型：
--
作者：
D. Terrade;P. Gentile;M. Cuoco;D. Manske
我们研究了由铁磁体（FM）和自旋三重态超导体（TSC）构成的弹道异质结构的物理性质，该结构具有沿着垂直于手性px+ipy配对发生的平面方向堆叠的层状结构，并假设界面处的自旋相关过程。我们使用一个自洽的Bogoliubov-de Gennes方法在一个三维晶格上，以获得对振幅和磁化强度的空间分布。我们发现，取决于铁磁交换场的强度，系统的基态可以有两个不同的配置与在散装和在接口处的磁矩之间的平行或反平行共线。我们证明了，如果体磁化强度沿沿着方向固定，则具有非共面界面、体自旋和库珀对自旋的磁态可以稳定。态密度的研究表明，FM中的电子谱的修改在最佳磁位形的设置中起着重要的作用。最后，我们发现在FM-TSC系统中存在诱导的自旋极化对关联。
We study the physical properties of a ballistic heterostructure made of a ferromagnet (FM) and a spin-triplet superconductor (TSC) with a layered structure stacking along the direction perpendicular to the planes where a chiral px+ipy pairing occurs and assuming spin dependent processes at the interface. We use a self-consistent Bogoliubov-de Gennes approach on a three-dimensional lattice to obtain the spatial profiles of the pairing amplitude and the magnetization. We find that, depending on the strength of the ferromagnetic exchange field, the ground state of the system can have two distinct configurations with a parallel or anti-parallel collinearity between the magnetic moments in the bulk and at the interface. We demonstrate that a magnetic state having non coplanar interface, bulk and Cooper pairs spins may be stabilized if the bulk magnetization is assumed to be fixed along a given direction. The study of the density of states reveals that the modification of the electronic spectrum in the FM plays an important role in the setting of the optimal magnetic configuration. Finally, we find the existence of induced spin-polarized pair correlations in the FM-TSC system.