Evidence for a disorder driven phase transition in the condensation of 4He in aerogels

Abstract

We report on thermodynamic and optical measurements of the condensation process of ${}^4$He in three silica aerogels of different microstructures. For the two base-catalysed aerogels, the temperature dependence of the shape of adsorption isotherms and of the morphology of the condensation process show evidence of a disorder driven transition, in agreement with recent theoretical predictions. This transition is not observed for a neutral-catalysed aerogel, which we interpret as due to a larger disorder in this case.

11 pages

References in corpus (2)

• A temperature-controlled device for volumetric measurements of Helium adsorption in porous media
• Compressed Silica Aerogels for the Study of Superfluid 3He

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