Orientational order in xenon fluid monolayers on single crystals of exfoliated graphite

S. E. Nagler, P. M. Horn, T. F. Rosenbaum, R. J. Birgeneau, M. Sutton, S. G. J. Mochrie, D. E. Moncton, Roy Clarke
1985 Physical Review B (Condensed Matter)  
The melting transition of Xe monolayers adsorbed on a single-crystal exfoliated graphite substrate has been studied by high-resolution synchrotron x-ray scattering. At temperatures slightly above the melting transition the fluid phase has a high degree of orientational order. The results are discussed in the context of current theories of two-dimensional melting including the effects of the substrate. finite density of unbound defects causing an exponential decay of order with the
more » ... length being the average separation between unbound defects. Defect-mediated transitions can be crudely divided into two generic classes. Transitions in the 2D XY model, superfluid, superconductor, Coulomb gas, and roughening (solid-on-solid) model belong to one class. ' This class of problems is characterized by a scalar interaction between defects. In general, these problems contain no cubic in-32 7373
doi:10.1103/physrevb.32.7373 pmid:9936881 fatcat:27xcsy533nh4fa5m6lrxl5rlg4