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Abstract
We have realized an integer quantum Hall system with superconducting contacts by connecting
graphene to niobium electrodes. Below their upper critical field of 4 tesla, an integer
quantum Hall effect coexists with superconductivity in the leads, but with a plateau
conductance that is larger than in the normal state. We ascribe this enhanced quantum
Hall plateau conductance to Andreev processes at the graphene-superconductor interface
leading to the formation of so-called Andreev edge-states. The enhancement depends
strongly on the filling-factor, and is less pronounced on the first plateau, due to
the special nature of the zero energy Landau level in monolayer graphene.