  It has been established empirically that the rate of addition of molecules to
the crystal during crystal growth from the melt is proportional to
exp(-|{\Delta}S_fus|/R) where {\Delta}S_fus is the entropy of fusion. Here we
show that this entropic slowdown arises directly from the separation of the
entropy loss and energy loss processes associated with the freezing of the
liquid. We present a theoretical treatment of the kinetics based on a model
flat energy landscape and derive an explicit expression for the coupling
magnitude in terms of the crystal-melt interfacial free energy. The
implications of our work for nucleation kinetics are also discussed.
