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arXiv · 1506.04959

Approaching magnetic ordering in graphene materials by FeCl$_3$ intercalation

T. H. Bointon·I. Khrapach·R. Yakimova·A. V. Shytov·M. F. Craciun·S. Russo
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Abstract

We show the successful intercalation of large area (1 cm$^2$) epitaxial few-layer graphene grown on 4H-SiC with FeCl$_3$. Upon intercalation the resistivity of this system drops from an average value of $\approx 200 \ \Omega/sq$ to $\approx 16 \ \Omega/sq$ at room temperature. The magneto-conductance shows a weak localization feature with a temperature dependence typical of graphene Dirac fermions demonstrating the decoupling into parallel hole gases of each carbon layer composing the FeCl$_3$ intercalated structure. The phase coherence length ($\approx 1.2 \mu$m at 280 mK) decreases rapidly only for temperatures higher than the 2-D magnetic ordering in the intercalant layer while it tends to saturate for temperatures lower than the antiferromagnetic ordering between the planes of FeCl$_3$ molecules providing the first evidence for magnetic ordering in the extreme two-dimensional limit of graphene.

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T. H. Bointon, I. Khrapach, R. Yakimova, A. V. Shytov, M. F. Craciun, S. Russo. 2015-06-16. Approaching magnetic ordering in graphene materials by FeCl$_3$ intercalation. https://doi.org/10.1021/nl4040779

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