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| VOLUME 100 (2014) | ISSUE 5 | PAGE 374 |
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On the superconductivity of graphite interfaces
P. Esquinazi, T. T. Heikkilä+, Y. V. Lysogorskiy*, D. A. Tayurskii*×, G. E. Volovik°∇
Division of Superconductivity and Magnetism, Institut für Experimentelle Physik II, Universität Leipzig, D-0413 Leipzig, Germany +Department of Physics and Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland *Institute of Physics, Kazan Federal University, 420008 Kazan, Russia ×Centre for Quantum Technologies, Kazan Federal University, 420008 Kazan, Russia °Low Temperature Laboratory, Aalto University, FI-00076 Aalto, Finland ∇Landau Institute for Theoretical Physics of the RAS, 142432 Chernogolovka, Russia
Abstract
We propose an explanation for the appearance of superconductivity at the interfaces of graphite with Bernal stacking order. A network of line defects with flat bands appears at the interfaces between two slightly twisted graphite structures. Due to the flat band the probability to find high temperature superconductivity at these quasi one-dimensional corridors is strongly enhanced. When the network of superconducting lines is dense it becomes effectively two-dimensional. The model provides an explanation for several reports on the observation of superconductivity up to room temperature in different oriented graphite samples, graphite powders as well as graphite-composite samples published in the past. |