A4 Refereed article in a conference publication
Electron and hole transmission through superconductor - Normal metal interfaces
Authors: Gloos K, Tuuli E
Editors: The Korean Physical Society
Publisher: KOREAN PHYSICAL SOC
Publication year: 2013
Journal: Journal- Korean Physical Society
Book title : Journal of the Korean Physical Society
Journal name in source: JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Journal acronym: J KOREAN PHYS SOC
Series title: 19th International Conference on Magnetism
Number in series: 10
Volume: 62
Issue: 10
First page : 1575
Last page: 1579
Number of pages: 5
ISSN: 0374-4884
DOI: https://doi.org/10.3938/jkps.62.1575
Abstract
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.
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.
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