Single-walled carbon nanotube weak links in Kondo regime with zero-field splitting

F. Wu, R. Danneau, P. Queipo, E. Kauppinen, T. Tsuneta, P. J. Hakonen

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Abstract

We have investigated proximity-induced supercurrents in single-walled carbon nanotubes in the Kondo regime and compared them with supercurrents obtained on the same tube with Fabry-Pérot resonances. Our data display a wide distribution of Kondo temperatures TK=1–14 K, and the measured critical current ICM vs TK displays two distinct branches; these branches, distinguished by zero-field splitting of the normal-state Kondo conductance peak, differ by an order of magnitude at large values of TK. Evidence for renormalization of Andreev levels in Kondo regime is also found.
Original languageEnglish
Article number073404
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B
Volume79
Issue number7
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Keywords

  • carbon nanotubes
  • critical currents
  • hyperfine interactions
  • Kondo effect
  • proximity effect (superconductivity)
  • superconducting materials

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