| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Cao, Y.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2021Investigating high opacity and increased activation energy in the multi-trigger resistcitations
- 2018Fine (Cr,Fe)2B borides on grain boundaries in a 10Cr–0.01B martensitic steelcitations
- 2018Unusual Suppression of the Superconducting Energy Gap and Critical Temperature in Atomically Thin NbSe2citations
- 2018Fine (Cr,Fe) 2 B borides on grain boundaries in a 10Cr–0.01B martensitic steelcitations
- 2017Test methods to determine durability of concrete under combined environmental actions and mechanical load: final report of RILEM TC 246-TDCcitations
- 2017Recommendation of RILEM TC 246-TDC: test methods to determine durability of concrete under combined environmental actions and mechanical load: Test method to determine the effect of applied stress on chloride diffusioncitations
- 2016High electron mobility, quantum Hall effect and anomalous optical response in atomically thin InSecitations
- 2016Intergranular crack tip oxidation in a Ni-base superalloycitations
- 2015Solution processed bismuth sulfide nanowire array core/silver shuffle shell solar cellscitations
- 2013Intergranular crack tip oxidation in a Ni-base superalloycitations
- 2013New atom probe approaches to studying segregation in nanocrystalline materialscitations
- 2008Identifying the limitation of Oliver and Pharr method in characterizing the viscoelasticplastic materials with respect to indenter geometry
Places of action
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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.