Superconductor-graphene-superconductor (SGS) junction provides a unique platform to study relativistic electrodynamics of Dirac fermions combined with proximity-induced superconductivity. We report observation of the Josephson effect in proximity-coupled superconducting junctions of graphene in contact with Pb1-xInx (x=0.07) electrodes for temperatures as high as T = 4.8K, with a large IcRn (~ 255 microV). This demonstrates that Pb1-xInx SGS junction would facilitate the development of the superconducting quantum information devices and superconductor-enhanced phase-coherent transport of graphene.
@article{arxiv.1101.5739,
title = {Observation of Supercurrent in PbIn-Graphene-PbIn Josephson Junction},
author = {Dongchan Jeong and Jae-Hyun Choi and Gil-Ho Lee and Sanghyun Jo and Yong-Joo Doh and Hu-Jong Lee},
journal= {arXiv preprint arXiv:1101.5739},
year = {2015}
}