Session Y23: Superconductivity: Proximity Effects

8:00 AM–10:36 AM, Friday, March 25, 2011
Room: D165

Sponsoring Unit: DCMP
Chair: Ulrich Welp, Argonne National Laboratory

Abstract ID: BAPS.2011.MAR.Y23.9

Abstract: Y23.00009 : S -N-S junction formed by graphene with lead (Pb) contacts

9:36 AM–9:48 AM

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  Ivan Borzenets
    (Duke University)

  Ulas Coskun
    (University of Illinois )

  Gleb Finkelstein
    (Duke University)

We fabricate lead (Pb) contacts to graphene that allow us to observe supercurrent in the Pb-graphene-Pb structure up to temperatures of $\sim $3K. The measured critical current is much smaller than a naive expectation based on calculations for a superconductor-insulator-superconductor (S-I-S) junction. Hysteresis is seen in the switching current despite the fact that the junction is made to be overdamped. The behavior of the Pb-graphene-Pb structure is qualitatively explained by considering it as an S-N-S junction.

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