Anisotropic Charge Conductance and Huge Tunneling Magnetoresistance in Ferromagnet/Noncentrosymmetric Superconductor Junctions
Anisotropic Charge Conductance and Huge Tunneling Magnetoresistance in Ferromagnet/Noncentrosymmetric Superconductor Junctions
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DOI：
10.1007/s10909-011-0399-0
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发表时间：
2011-09
影响因子：
2
通讯作者：
Biao Jin
中科院分区：
文献类型：
--
作者：
Biao Jin
本文基于Blonder-Tinkham-Klapwijk（BTK）理论，研究了准二维铁磁/非中心对称超导（FM/NCS）结中的隧穿电荷电导.研究发现，非中心对称超导体中的自旋-轨道耦合会引起亚带隙隧穿电荷电导对铁磁电极磁化方向的显著依赖性，从而产生一种新的磁阻效应，当铁磁处于半金属极限时，这种效应变得非常明显.我们还发现，磁化-取向相关的隧道谱可以为确定非中心对称超导体的自旋-轨道相互作用结构和配对对称性提供线索。
We study theoretically the tunneling charge conductance in quasi-two-dimensional ferromagnet/noncentrosymmetric superconductor (FM/NCS) junctions on the basis of the Blonder-Tinkham-Klapwijk (BTK) formalism. It is found that, spin-orbit coupling in the noncentrosymmetric superconductor may induce significant dependence of subgap tunneling charge conductance on the orientation of magnetization in the ferromagnet electrode, giving rise to a novel magnetoresistance effect; this effect becomes very pronounced when the ferromagnet is in the half metallic limit. We also find that, magnetization-orientation dependent tunneling spectroscopy may provide a clue to determine the structure of spin-orbit interaction and the pairing symmetry in noncentrosymmetric superconductor.