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21034 Graphene – Synthesis, Characterization, Properties anWdill-bAe-psept-lbiyc-IaN-tTiEoCnHs (a) Sample 1 (b) Sample 2 (c) Sample 3 Fig. 13. Current-voltage characteristic curves at different fixed temperatures for three different lamellae. The continuous lines that fit the data were obtained using the Ambegaokar & Halperin (1969) CVC for two Ri’s in (b) and one Ri in (c) within a Wheatstone bridge model, assuming different critical Josephson currents at different temperatures. No magnetic field was applied and the earth field was not shielded. between semiconducting normal regions (we assume that they run mostly parallel to the graphene layers) a remarkable effect must appear when a magnetic field is applied in the c-axis direction and less influence should be observed if it is applied parallel to the graphene planes. The results in Fig. 14 correspond to the situation where the field is applied parallel to the c-axis of the lamellae. The in-plane case is not shown here because no effect has been observed, as expected. Figure 14(a) shows the temperature behavior of the measured voltage with and without field. The shift to lower temperatures of the transition after applying 0.75 T is clearly shown for one of the samples. In the case of other sample a 0.1 T field radically changes the previously observed drop in voltage and a semiconducting-like behavior appears. This behavior resembles the MIT found already in HOPG and discussed in Section 4.2. Figure 14(b) shows the CVC at 4 K and 25 K with and without field. One can recognize that the effect ofPDF Image | GRAPHENE SYNTHESIS CHARACTERIZATION PROPERTIES
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