Condensation of helium in aerogels and athermal dynamics of the Random Field Ising Model

Abstract

High resolution measurements reveal that condensation isotherms of ${}^4$He in a silica aerogel become discontinuous below a critical temperature. We show that this behaviour 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 non-equilibrium effects in the phase transitions of disordered systems.

5 p + suppl. material

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Cited by in corpus (4)

• Spinodals with Disorder: from Avalanches in Random Magnets to Glassy Dynamics
• Finite-dimensional vestige of spinodal criticality above the dynamical glass transition
• Thermal vestiges of avalanches in the driven random field Ising model
• Inverse transitions and disappearance of the λ-line in the asymmetric random field Ising and Blume-Capel models