Abstract
We present small-angle neutron-scattering measurements of the static structure factor {ital S}({ital q}) of the binary fluid mixture water-lutidine imbibed into the porous glass Vycor as a function of temperature and composition. {ital S}({ital q}) changes from a Lorentzian in the one-phase region to a Lorentzian squared at the random-field transition. We relate the correlation lengths (9 A{approx lt}{xi}{approx lt}52 A) to the previously measured relaxation times and find finite-size and random-field effects.
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