2011/09/04 by I. V. Borzenets, U. C. Coskun, S. J. Jones +1 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.107.137005
published as Physical Review Letters 107, 137005 (2011) · 4 pages, 3 figures, PRL
arxiv created 2011/09/04 · arxiv updated 2013/06/25
We report on graphene-based Josephson junctions with contacts made from lead. The high transition temperature of this superconductor allows us to observe the supercurrent branch at temperatures up to ∼ 2 K, at which point we can detect a small, but non-zero, resistance. We attribute this resistance to the phase diffusion mechanism, which has not been yet identified in graphene. By measuring the resistance as a function of temperature and gate voltage, we can further characterize the nature of electromagnetic environment and dissipation in our samples.