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| Naji, M. |
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Zhu, M.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2023Spin fluctuations associated with the collapse of the pseudogap in a cuprate superconductorcitations
- 2023Spin fluctuations associated with the collapse of the pseudogap in a cuprate superconductor
- 2020JINGLE - IV. Dust, HI gas and metal scaling laws in the local Universecitations
- 2020JINGLE -- IV. Dust, HI gas and metal scaling laws in the local Universe
- 2020JINGLE – IV. Dust, H I gas, and metal scaling laws in the local universecitations
- 2018Unusual Suppression of the Superconducting Energy Gap and Critical Temperature in Atomically Thin NbSe2citations
- 2018Multi-instrument multi-scale experimental damage mechanics for fibre reinforced compositescitations
- 2018Effect of intra-ply voids on the homogenized behavior of a ply in multidirectional laminatescitations
- 2011Impact of Gd dopants on current polarization and the resulting effect on spin transfer velocity in Permalloy wirescitations
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article
Unusual Suppression of the Superconducting Energy Gap and Critical Temperature in Atomically Thin NbSe2
Abstract
It is well-known that superconductivity in thin films is generally suppressed with decreasing thickness. This suppression is normally governed by either disorder-induced localization of Cooper pairs, weakening of Coulomb screening, or generation and unbinding of vortex–antivortex pairs as described by the Berezinskii–Kosterlitz–Thouless (BKT) theory. Defying general expectations, few-layer NbSe2, an archetypal example of ultrathin superconductors, has been found to remain superconducting down to monolayer thickness. Here, we report measurements of both the superconducting energy gap Δ and critical temperature TC in high-quality monocrystals of few-layer NbSe2, using planar-junction tunneling spectroscopy and lateral transport. We observe a fully developed gap that rapidly reduces for devices with the number of layers N ≤ 5, as does their TC. We show that the observed reduction cannot be explained by disorder, and the BKT mechanism is also excluded by measuring its transition temperature that for all N remains very close to TC. We attribute the observed behavior to changes in the electronic band structure predicted for mono- and bi- layer NbSe2 combined with inevitable suppression of the Cooper pair density at the superconductor-vacuum interface. Our experimental results for N > 2 are in good agreement with the dependences of Δ and TC expected in the latter case while the effect of band-structure reconstruction is evidenced by a stronger suppression of Δ and the disappearance of its anisotropy for N = 2. The spatial scale involved in the surface suppression of the density of states is only a few angstroms but cannot be ignored for atomically thin superconductors.