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

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

2006-03-20

arxiv.org/abs/cond-mat/0603486v2

Physics

Condensed Matter

Soft Condensed Matter

4 pages latex

Scientific paper

We report on thermodynamic and optical measurements of the condensation process of $^4$He in two silica aerogels of same porosity 95%, but different microstructures resulting from different pH during synthesis. For a base-catalyzed aerogel, the temperature dependence of the shape of adsorption isotherms and of the morphology of the condensation process show evidence of a disorder induced transition,in agreement with recent theoretical predictions. This transition is not observed for a neutral-catalyzed aerogel, which we interpret as due to a larger disorder in this case.

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