Spin-triplet current in half metal/conical helimagnet/superconductor heterojunctions

被引：13
|
作者：
Jin, Li-Jing [1 ]
Wang, Yue [1 ]
Wen, Lin [1 ]
Zha, Guo-Qiao [1 ]
Zhou, Shi-Ping [1 ]
机构：
[1] Shanghai Univ, Dept Phys, Shanghai 200444, Peoples R China
来源：
PHYSICS LETTERS A | 2012年 / 376卷 / 35期
基金：
中国国家自然科学基金;
关键词：
Spin-flip Andreev reflection; Current oscillation; Differential conductance spectrum; THERMAL CONDUCTIVITY; FERROMAGNET; SUPERCURRENTS;
D O I：
10.1016/j.physleta.2012.06.017
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The BTK theory is extended to investigate spin-triplet current and differential conductance spectrum in the half metal/conical helimagnet (Holmium)/s-wave superconductor heterojunctions. We show that the effective spin-split and spin-flip scatterings of the Holmium layer control the conversion efficiency between the spin-singlet and equal-spin triplet pair correlations, leading to a tunneling current oscillation with the thickness of the Holmium layer. This can provide qualitative explanations on the current oscillation in Ho/Co/Ho-based Josephson junction experiment. The differential conductance spectrum confirms spin-flip Andreev reflection induced long-ranged equal-spin triplet pair correlations. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：2435 / 2441
页数：7
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