f波超导体/绝缘层/f波超导体结中势垒散射对直流Josephson电流的影响

Barrier Interface Scattering Effect on DC Josephson Current in f-Wave Superconductor/f-Wave Superconductor Junctions

通过计算界面势垒散射强度对直流Josephson电流的影响,研究了f波超导体/绝缘层/f波超导体结的直流Josephson电流与温度T和结两侧晶轴方位角之间的关系.我们发现:f波超导体/绝缘层/f波超导体结界面的势垒强度总是抑制结中准粒子的Andreev反射,降低流过f波超导体/绝缘层/f波超导体结的直流Josephson电流.当结两边晶轴方位角相同时,Josephson电流的振荡周期是2π;特别地,当结两边晶轴方位角不同时,其振荡周期不再是2π,而是会随着势垒强度的增大,振荡周期变小.

We study the temperature T and the phase of the Josephson critical current I（Ф） by taking into account the barrier interface scattering effect in a f-wave superconductor（S）/Insulator layer（I）/f-wave superconductor（S） junction. It is found that the Josephson critical currents in f-wave S/f-wave S, the barrier strength at inerface always suppress the Andreev reflection. Whenα =β, the phase dependence of the Josephson current I（Ф） between two f- wave S is predicted to be sinФ ; particularly, whenα≠β, the phase dependence of the Josephson current I（Ф） between two f-wave superconductors is not predicted to be sinФ and with the barrier strength increasing, the period of the sinФ turns decrease.