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.
@article{arxiv.1109.0769,
title = {Phase diffusion in graphene-based Josephson junctions},
author = {I. V. Borzenets and U. C. Coskun and S. J. Jones and G. Finkelstein},
journal= {arXiv preprint arXiv:1109.0769},
year = {2013}
}