Unconventional superconductivity and Josephson effect in superconductor/dirty normal metal/superconductor junctions

被引：44

作者：

Asano, Y ^{[1
]}

机构：

[1] Hokkaido Univ, Dept Appl Phys, Sapporo, Hokkaido 0608628, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2002年 / 71卷 / 03期

关键词：

unconventional superconductor; Andreev reflection; Josephson effect; zero-energy states;

D O I：

10.1143/JPSJ.71.905

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A relation between amplitudes of Josephson current and nodes in excitation-gap of unconventional superconductors is studied in superconductor/dirty normal metal/superconductor junctions. It is found that ensemble average of the Josephson current vanishes when the junction interface is perpendicular to a plane which includes line- or point-zeros of the excitation-gap. A zero-energy state formed at the junction interface is a character of unconventional superconductor junctions and causes large sample-to-sample fluctuations in the Josephson current in low temperatures. The disappearance of the ensemble-averaged Josephson current and the large fluctuations occur at the same time when the Cooper pairs have d- or f-wave pairing symmetries.

引用

页码：905 / 909

页数：5

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