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HYDRA – HYdrogen Dynamics at extreme pRessure: Advanced neutron spectroscopy

Objectif

Hydrogen, owing to its exceptionally low mass, is ruled by quantum effects: zero-point fluctuations, tunnelling, and rapid diffusion make its behaviour unlike any other element. Under extreme pressure these effects intensify, producing exotic states such as plastic and superionic ices, quantum rotor and nematic phases in hydrates, anomalous fluid transport, and superconductivity in dense hydrides. Yet the microscopic self-dynamics of hydrogen—diffusion, tunnelling, rotations, hopping—remain unexplored at the multi-GPa to megabar conditions relevant to planetary interiors and quantum materials.

HYDRA introduces a breakthrough: extending quasi-elastic and inelastic neutron scattering to 100 GPa by combining nano-polycrystalline diamond anvil cells with the unprecedented flux of the European Spallation Source. This will open a new frontier — the direct measurement of hydrogen dynamics under extreme compression.

HYDRA will explore four classes of systems where hydrogen dynamics control macroscopic behaviour: (i) Quantum ices — probing tunnelling, plastic and superionic regimes, and mapping transport coefficients for planetary modelling; (ii) Dense hydrates — host–guest quantum entanglement and validated H2–H2O potentials for dense hydrogen storage; (iii) Planetary fluids — diffusion in H2–H2O–CH₄–NH₃ mixtures to extend hydrodynamic models and constrain convection and magnetic fields in Uranus, Neptune, and exoplanets; (iv) Superconducting hydrides — disentangling anharmonic and diffusive proton dynamics from phonons to test their role in high-Tc pairing.

Mapping these fingerprints will deliver benchmark datasets, constrain condensed-matter and planetary models, and provide stringent tests for machine-learned ab initio potentials. Beyond scientific discovery, HYDRA will establish a paradigm shift: extending neutron spectroscopy into the extreme-pressure domain and opening new frontiers in physics, chemistry, planetary, and materials science.

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Programme(s)

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Régime de financement

HORIZON-ERC - HORIZON ERC Grants

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Appel à propositions

(s’ouvre dans une nouvelle fenêtre) ERC-2025-ADG

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Institution d’accueil

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
Contribution nette de l'UE
€ 3 385 408,00
Coût total
Aucune donnée

Bénéficiaires (1)