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Chin. Phys. B, 2008, Vol. 17(5): 1893-1901    DOI: 10.1088/1674-1056/17/5/058
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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)
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
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.
Keywords:  Zeeman effect      d-wave S/d-wave S      ferromagnetic d-wave superconductor      Josephson current  
Received:  24 April 2007      Revised:  05 November 2007      Accepted manuscript online: 
PACS:  74.50.+r (Tunneling phenomena; Josephson effects)  
  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)  
Fund: 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.

Cite this article: 

Liao Yan-Hua(廖艳华), Dong Zheng-Chao(董正超), Yin Zai-Feng(尹在峰), and Fu Hao(付浩) Zeeman effects on Josephson current in d-wave superconductor/d-wave superconductor junctions 2008 Chin. Phys. B 17 1893

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