Abstract
We study carbon nanotubes (CNTs) connected to Nb superconducting electrodes through a thin (less than 5 nm) Pd layer. We show that the carbon nanotubes form nanoscale point contacts detecting superconducting proximity effect via Andreev reflection, where an electron injected from the nanotube is reflected as a hole at the Pd/Nb interface and a Cooper pair forms in the Nb. Our data cannot be quantitatively explained by a single interface model, where only one interface between the CNT and a superconducting electrode is considered. Instead, we present a quantitative analysis that includes two separate interfaces---CNT/Pd and Nb/Pd---at each end of the CNT. The data can be used to determine the transparencies of the Pd/Nb and CNT/Pd interfaces.
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