Macroscopic-ranged proximity eﬀect in graphite.
We report the induction of proximity-induced superconducting features over macroscopic lengths in highly oriented pyrolitic graphite (HOPG). The phenomenon is triggered when electrical currents are injected in the material through superconducting electrodes, few millimeters apart from each other. Such large range is anomalous, as proximity-induced features in normal conductors hardly surpass few micrometers. The results can be explained as due presence of pre-existing superconductivity in graphite on small, localized regions.