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.
Received: 24 April 2007
Revised: 05 November 2007
Accepted manuscript online:
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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