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Macroscopic-ranged proximity effect in graphite
Bruno Cury Camargo1,2, Piotr Gierłowski2, Marek Kuzmiak3,4
1Faculty of Physics, University of Warsaw, Ul. Pasteura 5, 02-093 Warsaw, Poland.
Abstract:
We report proximity-induced superconducting features over macroscopic lengths in highly oriented pyrolytic graphite. The phenomenon is triggered when electrical currents are injected in the material through superconducting electrodes, few millimeters apart from each other. Such a large range is anomalous, as proximity-induced features in normal conductors hardly surpass few micrometers. The results can be explained as due to the presence of pre-existing superconductivity in graphite on small, localized regions.
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