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

S. Faßbender·M. Enderle·K. Knorr·J. D. Noh·H. Rieger
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Abstract

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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S. Faßbender, M. Enderle, K. Knorr, J. D. Noh, H. Rieger. 2001-08-29. Evidence for Kosterlitz-Thouless type orientational ordering of CF$_3$Br monolayers physisorbed on graphite. https://doi.org/10.1103/physrevb.65.165411

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