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VOLUME 88 | ISSUE 11 | PAGE 862
Proximity-induced superconductivity in graphene
M. V. Feigel'man, M. A. Skvortsov, K. S. Tikhonov
L.D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia
Moscow Institute of Physics and Technology, 141700 Moscow, Russia


PACS: 74.20.-z, 74.78.-w, 74.81.-g
Abstract
We propose a way of making graphene superconductive by putting on it small superconductive islands which cover a tiny fraction of graphene area. We show that the critical temperature, Tc, can reach several Kelvins at the experimentally accessible range of parameters. At low temperatures, T \ll T_c, and zero magnetic field, the density of states is characterized by a small gap E_g \leq T_c resulting from the collective proximity effect. Transverse magnetic field H_{g}(T) \propto E_g is expected to destroy the spectral gap driving graphene layer to a kind of a superconductive glass state. Melting of the glass state into a metal occurs at a higher field Hg2(T).


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