Proximity effect in a superconductor-metallofullerene-superconductor molecular junction

A. Yu. Kasumov, K. Tsukagoshi, M. Kawamura, T. Kobayashi, Y. Aoyagi, K. Senba, T. Kodama, H. Nishikawa, I. Ikemoto, K. Kikuchi, V. T. Volkov, Yu. A. Kasumov, R. Deblock, S. Guéron, and H. Bouchiat
Phys. Rev. B 72, 033414 – Published 25 July 2005

Abstract

We report low-temperature transport measurements through molecules of Gd metallofullerenes between superconducting suspended electrodes. The presence and number of molecules in the 2nm-wide gap between electrodes was determined by high resolution transmission electron microscopy. We find that a junction containing a single metallofullerene dimer between superconducting electrodes displays signs of proximity-induced superconductivity. In contrast, no proximity effect develops in junctions containing a larger cluster of metallofullerenes. These results can be understood by taking into account multiple Andreev reflections, and the spin states of the Gd atoms.

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  • Received 29 March 2005

DOI:https://doi.org/10.1103/PhysRevB.72.033414

©2005 American Physical Society

Authors & Affiliations

A. Yu. Kasumov1,2,3,*, K. Tsukagoshi1,4, M. Kawamura1, T. Kobayashi1, Y. Aoyagi1,5, K. Senba6, T. Kodama6, H. Nishikawa6, I. Ikemoto6, K. Kikuchi6, V. T. Volkov2, Yu. A. Kasumov2, R. Deblock3, S. Guéron3, and H. Bouchiat3

  • 1RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
  • 2Institute of Microelectronics Technology and High Purity Materials, RAS, Chernogolovka 142432 Moscow Region, Russia
  • 3Laboratoire de Physique des Solides, Associé au CNRS, Bâtiment 510, Université Paris-Sud, 91405 Orsay, France
  • 4PRESTO, JST, Honcho 4-1-8, Kawaguchi, Saitama, Japan
  • 5Department of Information Processing, Tokyo Institute of Technology, Nagatsuda 4259, Midori, Yokohama, Kanagawa 226-8502, Japan
  • 6Department of Chemistry, Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji, Tokyo 192-039, Japan

  • *Electronic address: kasumov@lps.u-psud.fr

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Vol. 72, Iss. 3 — 15 July 2005

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