Alternating Superconducting and Charge Density Wave Monolayers within Bulk 6R-TaS2

A Achari, J Bekaert, V Sreepal, A Orekhov… - Nano Letters, 2022 - ACS Publications
A Achari, J Bekaert, V Sreepal, A Orekhov, P Kumaravadivel, M Kim, N Gauquelin
Nano Letters, 2022ACS Publications
Van der Waals (vdW) heterostructures continue to attract intense interest as a route of
designing materials with novel properties that cannot be found in nature. Unfortunately, this
approach is currently limited to only a few layers that can be stacked on top of each other.
Here, we report a bulk vdW material consisting of superconducting 1H TaS2 monolayers
interlayered with 1T TaS2 monolayers displaying charge density waves (CDW). This bulk
vdW heterostructure is created by phase transition of 1T-TaS2 to 6R at 800° C in an inert …
Van der Waals (vdW) heterostructures continue to attract intense interest as a route of designing materials with novel properties that cannot be found in nature. Unfortunately, this approach is currently limited to only a few layers that can be stacked on top of each other. Here, we report a bulk vdW material consisting of superconducting 1H TaS2 monolayers interlayered with 1T TaS2 monolayers displaying charge density waves (CDW). This bulk vdW heterostructure is created by phase transition of 1T-TaS2 to 6R at 800 °C in an inert atmosphere. Its superconducting transition (Tc) is found at 2.6 K, exceeding the Tc of the bulk 2H phase. Using first-principles calculations, we argue that the coexistence of superconductivity and CDW within 6R-TaS2 stems from amalgamation of the properties of adjacent 1H and 1T monolayers, where the former dominates the superconducting state and the latter the CDW behavior.
ACS Publications
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