气凝胶中~ 4 He凝聚过程中无序驱动相变的证据
Evidence for a disorder driven phase transition in the condensation of 4He in aerogels
摘要：
本文报道了$^4$ He在三种不同微结构的SiO2气凝胶中凝聚过程的热力学和光学测量结果。对于这两种碱催化气凝胶，吸附等温线的形状和冷凝过程的形态的温度依赖性的无序驱动的过渡的证据，与最近的理论预测一致。对于中性催化的气凝胶没有观察到这种转变，我们将其解释为由于在这种情况下更大的无序。
英文摘要：
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.
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