Abstract
Deuterium physisorbed on exfoliated graphite preplated by a krypton monolayer has been investigated by heat–capacity measurements in the complete submonolayer coverage range up to the initial stages of bilayer film formation. A detailed phase diagram has been mapped out. The commensurate\(\left( {1x{\text{1}}} \right)\left[ {\frac{1}{2}} \right]\)phase covering most part of the phase diagram in the submonolayer region exhibits two–dimensional (2D) Ising symmetry. At the commensurate–incommensurate transition a reentrant fluid phase extending down to 1.5 K has been found, which confirms theoretical predictions.
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