Abstract
We have compared the surface properties of crystals respectively grown from normal 4He containing 130 ppb of 3He and from ultrapure 4He (0.4 ppb). Below 0.4 K, 3He impurities are found to decrease both the surface tension and the step energy. Our results are consistent with the existence of two-dimensional bound states for 3He atoms at the solid-liquid interface. Quantitative agreement with the data is found with a binding energy ε s ≈ 4.3 K and a 3He density saturating around 0.4 monolayer. The presence of steps is found to increase the binding energy by about 10 mK.
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