Effect of spin fluctuations on charge transport in diffusive normal metal/d-wave superconductor junctions

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• 作者：Iduru Shigeta ; Takehito Yokoyama ; Yasuhiro Asano ; Masahiko Hiroi ; Yukio Tanaka
• 关键词：Spin fluctuation ; Diffusive normal metal ; Superconducting proximity effect ; d-wave superconductor
• 刊名：Physica C
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：470
• 期：Supplement 1
• 页码：S854-S856
• 全文大小：285 K

文摘

The effect of spin fluctuations on the transport properties in diffusive normal metal/d-wave superconductor (DN/DS) junctions is studied under various situations by solving the Usadel equation with Nazarov’s generalized boundary condition. Tunneling conductance of the DN/DS junctions is calculated by changing the magnitude of the resistance in DN, Thouless energy in DN, the transparency of the insulating barrier, and the angle between the lobe direction of the d-wave pair potential and the normal to the interface, together with the magnitude of spin fluctuations. A zero-bias conductance dip (ZBCD) and a zero-bias conductance peak (ZBCP) occur in line shapes by way of a coherent Andreev reflection (CAR) around zero energy in the system of DN/DS junctions. We have found that both of the ZBCD and the ZBCP become narrower with the increasing magnitude of spin fluctuations.