Multilayer graphene with different stacking sequences has emerged as a powerful setting for correlated
and topological phases. In parallel, progress in graphene heterostructures with magnetic or correlated
materials—most notably the Kitaev candidate α-RuCl3 —has demonstrated charge transfer, magnetic
proximity effects, and interfacial reconstruction, creating new opportunities for engineered quantum
systems. Motivated by these developments, we explore a three-dimensional analogue in which α-RuCl3
layers are inserted directly into the van der Waals gaps of graphite, forming an intercalated system. Here,
we report the successful synthesis and comprehensive characterization of graphite intercalated with α-
RuCl3. Using a combination of X-ray diffraction, quantum oscillation measurements, and first-principles
electronic structure calculations, we study the structural and electronic properties of this intercalated
crystals. Our results demonstrate that graphite intercalated with α-RuCl3 offers a robust route to
develop three-dimensional materials with access to novel correlated and topological states.

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