Alternating Superconducting and Charge Density Wave Monolayers within Bulk 6R-TaS<sub>2</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35857927.
- Also identified by DOI 10.1021/acs.nanolett.2c01851 and PMC identifier 9373026.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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 TaS<sub>2</sub> monolayers interlayered with 1T TaS<sub>2</sub> monolayers displaying charge density waves (CDW). This bulk vdW heterostructure is created by phase transition of 1T-TaS<sub>2</sub> to 6R at 800 °C in an inert atmosphere. Its superconducting transition (<i>T</i><sub>c</sub>) is found at 2.6 K, exceeding the <i>T</i><sub>c</sub> of the bulk 2H phase. Using first-principles calculations, we argue that the coexistence of superconductivity and CDW within 6R-TaS<sub>2</sub> 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.