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Tuning the wetting transition: Prewetting and superfluidity of 4He on thin cesium substrates.

We have deposited cesium with monolayer thickness resolution on to the surfaces of a low-temperature quartz microbalance. By controlling the cesium thickness from 1 to 25 monolayers, we have been able to continuously tune the substrate adsorption potential and observe its effect on the 4 He prewetting phase diagram. The wetting temperature can be conveniently adjusted between 1 and 2 K. Features in both the frequency shift and the dissipation of the microbalance were used to map out the superfluid-normal boundary in the prewetting phase diagram. The transition from thin normal to thick superfluid occurs without the dissipation peak characteristic of a Kosterlitz-Thouless transition