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Monolayers of the halomethane CF$_3$Br adsorbed on graphite have beeninvestigated by x-ray diffraction. The layers crystallize in a commensuratetriangular lattice. On cooling they approach a three-sublatticeantiferroelectric pattern of the in-plane components of the dipole moments. Theordering is not consistent with a conventional phase transition, but points toKosterlitz-Thouless behavior. It is argued that the transition is described bya 6-state clock model on a triangular lattice with antiferromagnetic nearestneighbor interactions which is studied with Monte-Carlo simulations. Afinite-size scaling analysis shows that the ordering transition is indeed inthe KT universality class.Comment: 4 pages, 5 figure

physical review. b, condensed matter

Evidence for Kosterlitz-Thouless-type orientational ordering of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CF</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">Br</mml:mi></mml:math>monolayers physisorbed on graphite

Evidence for Kosterlitz-Thouless-type orientational ordering ofCF3Brmonolayers physisorbed on graphite