| 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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Errea, Ion
Agence Nationale de la Recherche
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2024Prediction of ambient pressure conventional superconductivity above 80 K in hydride compoundscitations
- 2024Searching Materials Space for Hydride Superconductors at Ambient Pressurecitations
- 2024Searching materials space for hydride superconductors at ambient pressurecitations
- 2023Excitonic insulator to superconductor phase transition in ultra-compressed heliumcitations
- 2023Evidence for ground state coherence in a two-dimensional Kondo latticecitations
- 2023Evidence for ground state coherence in a two-dimensional Kondo latticecitations
- 2023Excitonic insulator to superconductor phase transition in ultra-compressed helium.
- 2022Transport and optical properties of the chiral semiconductor Ag3AuSe2citations
- 2021Strong anharmonic and quantum effects in Pm3¯n AlH3 under high pressure: A first-principles studycitations
- 2021The Landau-Peierls distortion in the linear acetylenic carbon chain: an ab-initio study of the interplay betweenelectronic correlations and anharmonic lattice dynamics
- 2021Strong correlation between bonding network and critical temperature in hydrogen-based superconductorscitations
- 2021Dominant role of quantum anharmonicity in the stability and optical properties of infinite linear acetylenic carbon chainscitations
- 2020Infrared Permittivity of the Biaxial van der Waals Semiconductor alpha-MoO3 from Near- and Far-Field Correlative Studiescitations
- 2018Strong electron-phonon and band structure effects in the optical properties of high pressure metallic hydrogencitations
- 2016Anharmonic effects in atomic hydrogen: Superconductivity and lattice dynamical stabilitycitations
- 2016Anharmonic enhancement of superconductivity in metallic molecular Cmca-4 hydrogen at high pressure: a first-principles studycitations
- 2016Anharmonic enhancement of superconductivity in metallic molecular Cmca − 4 hydrogen at high pressure: a first-principles studycitations
- 2015Strong anharmonicity induces quantum melting of charge density wave in 2H−NbSe2 under pressurecitations
- 2014Novel superconducting skutterudite-type phosphorus nitride at high pressure from first-principles calculationscitations
Places of action
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article
Strong anharmonicity induces quantum melting of charge density wave in 2H−NbSe2 under pressure
Abstract
The interplay between charge density wave (CDW) order and superconductivity has attracted much attention. This isthe central issue of a long standing debate in simple transition metal dichalcogenides without strong electronic correlations, such as 2H-NbSe$_2$, in which two such phases coexist. The importance of anisotropic electron-phonon interaction has been recently highlighted from both theoretical and experimental point of view, and explains some of the key features of the formation of the CDW in this system. On the other hand, other aspects, such as the effects of anharmonicity, remain poorly understood despite their manifest importance in such soft-phonon driven phase transition. At the theoretical level in particular, their prohibitive computational price usually prevents their investigation within conventional perturbative approaches.Here, we address this issue using a combination of high resolution inelastic X-ray scattering measurements of the phonon dispersion, as a function of temperature and pressure, with state of the art ab initio calculations. By explicitly taking into account anharmonic effects, we obtain an accurate, quantitative, description of the (P,T) dependence of the phonon spectrum, accounting for the rapid destruction of the CDW under pressure by zero mode vibrations - or quantum fluctuations - of the lattice. The low-energy longitudinal acoustic mode that drives the CDW transition barely contributes to superconductivity, explaining the insensitivity of the superconducting critical temperature to the CDW transition.