Transport properties of a few hundreds of nanometers thick (in
the graphene plane direction) lamellae of highly oriented pyrolytic graphite
(HOPG) have been investigated. Current–voltage characteristics as well as
the temperature dependence of the voltage at different fixed input currents
provide evidence for Josephson-coupled superconducting regions embedded in
the internal two-dimensional interfaces of HOPG, reaching zero resistance at low
enough temperatures
