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在正常金属-铁磁绝缘层-d波超导隧道结中，考虑到铁磁绝缘层的粗糙界面散射和磁散射效应，运用Bogoliubov-de Gennes(BdG)方程和Blonder-Tinkham-klapwijk(BTk)理论模型，计算隧道结中的准粒子传输系数和微分电导.计算表明：1)粗糙界面散射和磁散射都能压低零偏压电导峰，其中磁散射能使零偏压峰滑移，而粗糙界面却能阻止零偏压峰的滑移，且随着两种散射强度的逐渐增大，又能使零偏压电导峰渐渐变为凹陷；(2)当铁磁层离开超导表面有若干相干长度时，隧道谱中将呈现一些子能隙谐振峰.Taking into account the rough interface scattering and magnetic scattering effects of the ferromagnet layer in the normal metal-ferromagnet insulator-d wave superconductor junctions,using Bogoliubov-de Gennes equations and Blonder-Tinkham-Klapwijk model,we have calculated the differential conductance.It is found that:1)both rough interface scattering and magnetic scattering can suppress the zero-bias conductance peaks(ZBCP),in which the magnetic scattering can lead to a splitting of the ZBCP but the rough interface can resist the splitting,and the ZBCP will evolve some dips due to two higher potentials of the scattering;2)the subgap resonances in the differential conductance are predicted under the condition of a ferromagnet layer located at a distance several times larger than the coherence length from the superconductor interface.
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中国物理学会期刊
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