title: Condensation of helium in aerogel and athermal dynamics of the random-field Ising model.
abstract: High resolution measurements reveal that condensation isotherms of (4)He in high porosity silica aerogel become discontinuous below a critical temperature. We show that this behavior does not correspond to an equilibrium phase transition modified by the disorder induced by the aerogel structure, but to the disorder-driven critical point predicted for the athermal out-of-equilibrium dynamics of the random-field Ising model. Our results evidence the key role of nonequilibrium effects in the phase transitions of disordered systems.
authors.affiliation: Université Grenoble Alpes, Institut Néel, F-38042 Grenoble, France and CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: Geoffroy J
authors.initials: GJ
authors.lastname: Aubry
authors.affiliation: Université Grenoble Alpes, Institut Néel, F-38042 Grenoble, France and CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: Fabien
authors.initials: F
authors.lastname: Bonnet
authors.affiliation: Université Grenoble Alpes, Institut Néel, F-38042 Grenoble, France and CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Melich
authors.affiliation: Université Grenoble Alpes, Institut Néel, F-38042 Grenoble, France and CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Guyon
authors.affiliation: Université Grenoble Alpes, Institut Néel, F-38042 Grenoble, France and CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: Panayotis
authors.initials: P
authors.lastname: Spathis
authors.affiliation: Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France and CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France.
authors.forename: Florence
authors.initials: F
authors.lastname: Despetis
authors.affiliation: Université Grenoble Alpes, Institut Néel, F-38042 Grenoble, France and CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: Pierre-Etienne
authors.initials: PE
authors.lastname: Wolf