Electron and hole transmission through superconductor - Normal metal interfaces

被引：4
作者：
Gloos, Kurt [1 ,2 ]
Tuuli, Elina [1 ,3 ]
机构：
[1] Univ Turku, Wihuri Phys Lab, Dept Phys & Astron, FIN-20014 Turku, Finland
[2] Turku Univ, Ctr Mat & Surfaces MatSurf, FIN-20014 Turku, Finland
[3] Univ Jyvaskyla, Natl Doctoral Programme Nanosci NGS NANO, FIN-40014 Jyvaskyla, Finland
来源：
JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2013年 / 62卷 / 10期
关键词：
Point contacts; Metal interfaces; Normal reflection; Andreev reflection; SPIN POLARIZATION; POINT CONTACTS; HEAVY; CONDUCTANCE; TRANSITION;
D O I：
10.3938/jkps.62.1575
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have investigated the transmission of electrons and holes through interfaces between superconducting aluminum (T (c) = 1.2K) and various normal non-magnetic metals (copper, gold, palladium, platinum, and silver) using Andreev-reflection spectroscopy at T = 0.1K. We analysed the point contacts with the modified BTK theory that includes Dynes' lifetime as a fitting parameter I" in addition to superconducting energy gap 2 Delta and normal reflection described by Z. For contact areas from 1 nm(2) to 10000nm(2) the BTK Z parameter was 0.5, corresponding to transmission coefficients of about 80%, independent of the normal metal. The very small variation of Z indicates that the interfaces have a negligible dielectric tunneling barrier. Fermi surface mismatch does not account for the observed transmission coefficient.
引用
收藏
页码：1575 / 1579
页数：5
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