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Van der Waals (vdW) heterostructures continue to attract intense interest asa route of designing materials with novel properties that cannot be found innaturally occurring materials. Unfortunately, this approach is currentlylimited to only a few layers that can be stacked on top of each other. Here wereport a bulk material consisting of superconducting monolayers interlayeredwith monolayers displaying charge density waves (CDW). This bulk vdWheterostructure is created by phase transition of 1T-TaS2 to 6R at 800 {\deg}Cin an inert atmosphere. Electron microscopy analysis directly shows thepresence of alternating 1T and 1H monolayers within the resulting bulk 6Rphase. Its superconducting transition (Tc) is found at 2.6 K, exceeding the Tcof the bulk 2H phase of TaS2. The superconducting temperature can be furtherincreased to 3.6 K by exfoliating 6R-TaS2 and then restacking its layers. Usingfirst-principles calculations, we argue that the coexistence ofsuperconductivity and CDW within 6R-TaS2 stems from amalgamation of theproperties of adjacent 1H and 1T monolayers, where the former dominates thesuperconducting state and the latter the CDW behavior.

Alternating superconducting and charge density wave monolayers within bulk 6R-TaS2