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Experimental Study of the Intrinsic and Exxpetriminenstaicl StTudryaonf tshepInotrintsiPc arnodpExetrintsieic sTraonsfpoGrt rParopehrtietseofaGnradphiMte aundltMigurltiagrpaphenne SeamSpalesmples 13251 (a) (b) Fig. 14. (a) Voltage dependence on temperature for two different lamellae. Upper picture: The transition denoted by the sharp decrease in the voltage below a certain temperature (black squares) is shifted to lower values when 0.75 T is applied perpendicular to the planes (red dots). Bottom picture: Similar to the other picture but for a different lamella. The zero field (black squares) transition is completely suppressed after applying 0.1 T (red dots). (b) Current-voltage characteristic curves for a different lamella, with (red dots) and without field (black squares) at 4 K (upper graph) and 25 K (bottom graph). the field is to reduce the superconducting effect, i.e. the CVC tends to a linear, positive voltage behavior. Heersche et al. (2007) showed that Cooper pairs can flow in a single graphene layer relatively long distances between two superconducting contacts. The authors showed also the existence of Josephson currents. These results support the main idea proposed in this Section concerning the weakly Josephson coupled superconducting regions through a graphene layer. In addition to the work of Heersche et al. (2007), Hagymási et al. (2010) developed a theory for the Josephson critical current in ballistic Superconductor-Graphene-Superconductor structures. We use their model to calculate the reduced temperature dependent critical Josephson current. In Fig. 15 the reader can see the solid line obtained from the model proposed and the experimental data taken from the experimental work described in this Section. The model fits well the data. In the near future further investigations concerning the effect of the magnetic field in these lamellae are needed.PDF Image | GRAPHENE SYNTHESIS CHARACTERIZATION PROPERTIES
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