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

• 来源期刊: 中国物理B（英文版）
• 关键词: Zeeman effect d-wave S/d-wave S ferromagnetic d-wave superconductor Josephson current
• 年，卷（期）: 2008,（5）
• 页码范围: 1893-1901
• 页数: 9页
• 语种: 英文

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.