中国物理B ›› 2008, Vol. 17 ›› Issue (5): 1893-1901.doi: 10.1088/1674-1056/17/5/058

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Zeeman effects on Josephson current in d-wave superconductor/d-wave superconductor junctions

董正超1, 付 浩1, 廖艳华2, 尹在峰2   

  1. (1)Department of Physics, Huaiyin Teachers College and Jiangsu Province Key Laboratory for Chemistry of Low-Dimensional Materials, Huaian 223001, China; (2)Department of Physics, Huaiyin Teachers College and Jiangsu Province Key Laboratory for Chemistry of Low-Dimensional Materials, Huaian 223001, China;Department of Physics, College of Science, Yanbian University, Yanji 133002, China
  • 收稿日期:2007-04-24 修回日期:2007-11-05 出版日期:2008-05-20 发布日期:2008-05-20
  • 基金资助:
    Project supported by the Natural Science Foundation of Education Bureau of Jiangsu Province of China (Grant No 05KJB140008) and the `333' Project Funds of Jiangsu Province of China.

Zeeman effects on Josephson current in d-wave superconductor/d-wave superconductor junctions

Liao Yan-Hua(廖艳华)a)b), Dong Zheng-Chao(董正超)a)†, Yin Zai-Feng(尹在峰)a)b), and Fu Hao(付浩)a)   

  1. a Department of Physics, Huaiyin Teachers College and Jiangsu Province Key Laboratory for Chemistry of Low-Dimensional Materials, Huaian 223001, China; b Department of Physics, College of Science, Yanbian University, Yanji 133002, China
  • Received:2007-04-24 Revised:2007-11-05 Online:2008-05-20 Published:2008-05-20
  • Supported by:
    Project supported by the Natural Science Foundation of Education Bureau of Jiangsu Province of China (Grant No 05KJB140008) and the `333' Project Funds of Jiangsu Province of China.

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摘要： This paper solves a self-consistent equation for the d-wave superconducting gap and the effective exchange field in the mean-field approximation, and studies the Zeeman effects on the d-wave superconducting gap and thermodynamic potential. The Josephson currents in the d-wave superconductor(S)/insulating layer(I)/d-wave S junctions are calculated as a function of the temperature, exchange field, and insulating barrier strength under a Zeeman magnetic field on the two d-wave Ss. It is found that the Josephson critical currents in d-wave S/d-wave S junction to a great extent depend on the relative orientation of the effective exchange field of the two S electrodes, and the crystal orientation of the d-wave S. The exchange field under certain conditions can enhance the Josephson critical current in a d-wave S/I/d-wave S junction.

关键词: Zeeman effect, d-wave S/d-wave S, ferromagnetic d-wave superconductor, Josephson current

Abstract: This paper solves a self-consistent equation for the d-wave superconducting gap and the effective exchange field in the mean-field approximation, and studies the Zeeman effects on the d-wave superconducting gap and thermodynamic potential. The Josephson currents in the d-wave superconductor(S)/insulating layer(I)/d-wave S junctions are calculated as a function of the temperature, exchange field, and insulating barrier strength under a Zeeman magnetic field on the two d-wave Ss. It is found that the Josephson critical currents in d-wave S/d-wave S junction to a great extent depend on the relative orientation of the effective exchange field of the two S electrodes, and the crystal orientation of the d-wave S. The exchange field under certain conditions can enhance the Josephson critical current in a d-wave S/I/d-wave S junction.

Key words: Zeeman effect, d-wave S/d-wave S, ferromagnetic d-wave superconductor, Josephson current

中图分类号:  (Tunneling phenomena; Josephson effects)

  • 74.50.+r
74.20.Rp (Pairing symmetries (other than s-wave)) 74.25.Bt (Thermodynamic properties) 74.25.Ha (Magnetic properties including vortex structures and related phenomena) 74.25.Jb (Electronic structure (photoemission, etc.)) 74.25.Sv (Critical currents)