Abstract
We report on an experimental study of diffusive transport near the highly transparent interface of niobium(Nb)/multi-walled carbon nanotube (MWNT) junctions realized by utilizing the nanopores of alumina membranes. In the magnetic-field dependence of observed conductance increase, the transition temperatures vs nanotube length diagram, and the zero-bias conductance peak, we observed proximity-induced superconductivity with an onset temperature of T=9K at the highest case and its re-entrant conductance. These phenomena are manifestations of the extremely large diffusion constant of the Cooper pairs in our MWNTs.
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