中国物理B ›› 2007, Vol. 16 ›› Issue (10): 3072-3079.doi: 10.1088/1009-1963/16/10/042

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Proximity effects in normal mental/spin-splitting material/superconductor junctions

郁华玲, 董正超   

  1. Department of Physics, Huaiyin Teachers College, Huaian 223001, China
  • 收稿日期:2007-03-03 修回日期:2007-04-16 出版日期:2007-10-08 发布日期:2007-10-08
  • 基金资助:
    Project supported by the Natural Science Foundation of Education Bureau of Jiangsu Province, China (Grant No 05KJB140008), and the Program for Excellent Talents in Huaiyin Teachers College, China.

Proximity effects in normal mental/spin-splitting material/superconductor junctions

Yu Hua-Ling(郁华玲)† and Dong Zheng-Chao(董正超)   

  1. Department of Physics, Huaiyin Teachers College, Huaian 223001, China
  • Received:2007-03-03 Revised:2007-04-16 Online:2007-10-08 Published:2007-10-08
  • Supported by:
    Project supported by the Natural Science Foundation of Education Bureau of Jiangsu Province, China (Grant No 05KJB140008), and the Program for Excellent Talents in Huaiyin Teachers College, China.

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摘要： We extend the Blonder, Tinkham and Klapwijk (BTK) theory to the study of the coexistence between ferromagnetism and s-wave superconductivity in ferromagnet/superconductor (F/S) structures. It is found that the ferromagnetism and s-wave superconductivity can coexist near the F/S interface, which is induced by proximity effects. On the F side, the density of states (DOS) exhibits some superconducting-like properties, and it displays a damped oscillation from `0' to `$\pi$' states with increasing either the thickness of F film or the exchange energy. We also study the influences of the spin-polarized exchange splitting in the F and the spin-degeneracy by Rashba spin--orbit coupling (RSOC) in the two-dimensional electron gas (2DGE) on the proximity effects. It is shown that the case of Rashba spin-degeneracy is very different from that of the spin-polarized exchange splitting.

关键词: proximity effects, `\pi' state, Rashba spin--orbit coupling

Abstract: We extend the Blonder, Tinkham and Klapwijk (BTK) theory to the study of the coexistence between ferromagnetism and s-wave superconductivity in ferromagnet/superconductor (F/S) structures. It is found that the ferromagnetism and s-wave superconductivity can coexist near the F/S interface, which is induced by proximity effects. On the F side, the density of states (DOS) exhibits some superconducting-like properties, and it displays a damped oscillation from `0' to `$\pi$' states with increasing either the thickness of F film or the exchange energy. We also study the influences of the spin-polarized exchange splitting in the F and the spin-degeneracy by Rashba spin--orbit coupling (RSOC) in the two-dimensional electron gas (2DGE) on the proximity effects. It is shown that the case of Rashba spin-degeneracy is very different from that of the spin-polarized exchange splitting.

Key words: proximity effects, `$\pi$' state, Rashba spin--orbit coupling

中图分类号:  (Proximity effects; Andreev reflection; SN and SNS junctions)

  • 74.45.+c
74.20.Rp (Pairing symmetries (other than s-wave)) 74.25.Jb (Electronic structure (photoemission, etc.))