Phase diffusion in graphene-based Josephson junctions
  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 $\sim 2$ 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. 
I.V. Borzenets, U.C. Coskun, S.J. Jones, and G. Finkelstein
cond-mat.mes-hall cond-mat.supr-con