双层结构铁磁-超导隧道结的直流Josephson电流

通过求解Bogoliubov_de Gennes(BdG)方程得到铁磁超导共存态(FS)的自洽方程，在考虑结 界面的粗糙情形下，由推广的Furusaki_Tsukada(FT)的电流公式计算了铁磁超导态/ 绝缘层 / 铁磁超导态(FS/I/FS)结的直流Josephson电流，讨论了FS/I/FS结的直流Josephson临界 电流随磁交换能、温度的变化情况.研究表明：当结界面势垒散射强度和粗糙势垒散射强度 比较弱时磁交换能总是抑制FS/I/FS结的直流Josephson临界电流，而当结左右两边FS中铁 关键词： FS/I/FS超导隧道结 铁磁超导共存态 直流Josephson电流 粗糙势垒散射

The dc Josephson current in double ferromagnet-superconductor tunnel junctions

Using Bogoliubov_de Gennes equations,we obtain the self_consistent equation in a ferromagnetic superconductor. Taking into account the rough interface scatterin g effects, within Bogoliubov_de Gennes equations and Furusaki_Tsukada formula we calculate the dc Josephson current in the double ferromagnet_superconductor tun nel junctions. It is found that dc Josephson currents in FS/I/FS are suppressed by the ferromagnetic exchange interaction for weak barrier strength and weak rou gh interface scattering strength. The only exception that the dc Josephson curre nts increase with the ferromagnetic exchange interaction occurs if all three con ditions are satisfied: at low temperature, for strong barrier strength or strong rough interface scattering strength, and in an antiparallel configuration.