势垒散射对双层d波超导结直流Josephson电流的影响

摘要

The d. c. Josephson effect has been studied by taking into account the barrier interface scattering effect in a d-wave superconductor/insulator/d-wave superconductor junctions. We calcu-late the d. c. Josephson current based on the Bogoliubov de Gennes(BdG) equation and Furusaki-Tsukada( FT) formula. It is found that the d. c. Josephson current depends strongly on the crystalline axis orientation of d-wave superconductor in d-wave superconductor /insulator/d-wave superconductor junctions, the barrier strength at interface always suppress the Andreev reflection.%在d波超导体/绝缘层/d波超导体(dS/I/dS)中,考虑到结界面势垒散射,运用Bogoliubov-de Gennes(BdG)方程和推广的Furusaki-Tsukada(FT)电流公式,计算了超导结中准粒子的传输系数和直流Josephson电流.研究结果表明:dS/I/dS结中的Josephson电流随着温度的变化曲线强烈依赖于d波超导体的晶轴方位,并且结界面处的势垒散射始终对Andreev反射有抑制作用.