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. 2016 Mar 16;6:23254. doi: 10.1038/srep23254

Figure 2. Superconductivity in Ca-GL, Ca-RGOL and Ca-GBNLs.

Figure 2

(a) Temperature dependence of the electrical resistivity of a 3 μm thick 3 × 3 mm sample of Ca-GL showing a superconducting transition at ≈12 K. The inset shows the evolution of R(T) with increasing external magnetic field, H. The sample did not reach zero-resistance state, probably as a result of partial degradation because of brief exposure to air during transfer into a cryostat (Methods). (b) Temperature dependence of ZFC and FC magnetisation for Ca-RGOL at 4 Oe applied parallel to the graphene plane. The inset shows an example of the corresponding M(H); T = 1.8 K. (c) Magnetisation of Ca-GBNLs with different BN contents (M is normalised to the graphene content, i.e. only the mass of graphene is included for each GBNL). The inset shows the dependence of Tc on BN concentration (weight %).