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正常金属-铁磁绝缘层-d波超导结中的磁散射对量子输运的影响

董正超

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正常金属-铁磁绝缘层-d波超导结中的磁散射对量子输运的影响

董正超

MAGNETIC SCATTERING EFFECT ON QUANTUM TRANSPORT IN THE NORMAL METAL FERROMAGNET INSULATOR-d WAVE SUPERCONDUCTOR JUNCTIONS

DONG ZHENG-CHAO
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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.
    • 基金项目: 江苏省教育委员会自然科学基金(批准号:JW990)资助的课题.
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  • 文章访问数:  6403
  • PDF下载量:  687
  • 被引次数: 0
出版历程
  • 收稿日期:  1999-03-03
  • 刊出日期:  1999-06-05

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