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High-quality monolayer superconductor NbSe 2 grown by chemical vapour deposition.
- Source :
-
Nature communications [Nat Commun] 2017 Aug 30; Vol. 8 (1), pp. 394. Date of Electronic Publication: 2017 Aug 30. - Publication Year :
- 2017
-
Abstract
- The discovery of monolayer superconductors bears consequences for both fundamental physics and device applications. Currently, the growth of superconducting monolayers can only occur under ultrahigh vacuum and on specific lattice-matched or dangling bond-free substrates, to minimize environment- and substrate-induced disorders/defects. Such severe growth requirements limit the exploration of novel two-dimensional superconductivity and related nanodevices. Here we demonstrate the experimental realization of superconductivity in a chemical vapour deposition grown monolayer material-NbSe <subscript>2</subscript> . Atomic-resolution scanning transmission electron microscope imaging reveals the atomic structure of the intrinsic point defects and grain boundaries in monolayer NbSe <subscript>2</subscript> , and confirms the low defect concentration in our high-quality film, which is the key to two-dimensional superconductivity. By using monolayer chemical vapour deposited graphene as a protective capping layer, thickness-dependent superconducting properties are observed in as-grown NbSe <subscript>2</subscript> with a transition temperature increasing from 1.0 K in monolayer to 4.56 K in 10-layer.Two-dimensional superconductors will likely have applications not only in devices, but also in the study of fundamental physics. Here, Wang et al. demonstrate the CVD growth of superconducting NbSe2 on a variety of substrates, making these novel materials increasingly accessible.
Details
- Language :
- English
- ISSN :
- 2041-1723
- Volume :
- 8
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Nature communications
- Publication Type :
- Academic Journal
- Accession number :
- 28855521
- Full Text :
- https://doi.org/10.1038/s41467-017-00427-5