Reentrant disordered phase in two-layer films of Kr on graphite

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Abstract
We present synchrotron x-ray-scattering measurements probing the second-layer critical-point region of krypton on graphite. We find that the ‘‘condensation critical point’’ is actually a multicritical point with a line of continuous melting transitions extending towards high temperatures. A disordered intermediate phase lies between this melting transition and a continuous bilayer ordering transition at higher chemical potential. The intermediate phase appears to have a melted second layer which induces reentrant disorder in the first layer.