Evidence for Kosterlitz-Thouless type orientational ordering of CF$_3$Br monolayers physisorbed on graphite

Details Evidence for Kosterlitz-Thouless type orientational ordering of CF$_3$Br monolayers physisorbed on graphite Evidence for Kosterlitz-Thouless type orientational ordering of CF$_3$Br monolayers physisorbed on graphite

2001-08-29

arxiv.org/abs/cond-mat/0108495v1

Phys. Rev. B 65, 165411 (2002).

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.65.165411

Monolayers of the halomethane CF$_3$Br adsorbed on graphite have been investigated by x-ray diffraction. The layers crystallize in a commensurate triangular lattice. On cooling they approach a three-sublattice antiferroelectric pattern of the in-plane components of the dipole moments. The ordering is not consistent with a conventional phase transition, but points to Kosterlitz-Thouless behavior. It is argued that the transition is described by a 6-state clock model on a triangular lattice with antiferromagnetic nearest neighbor interactions which is studied with Monte-Carlo simulations. A finite-size scaling analysis shows that the ordering transition is indeed in the KT universality class.

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