Floating two-dimensional solid monolayer of C60 on graphite

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Floating two-dimensional solid monolayer of C60 on graphite

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dc.contributor.author Shin, H.
dc.contributor.author O'Donnell, S. E.
dc.contributor.author Reinke, P.
dc.contributor.author Ferralis, N.
dc.contributor.author Schmid, A. K.
dc.contributor.author Li, H. I.
dc.contributor.author Novaco, Anthony D.
dc.contributor.author Bruch, L. W.
dc.contributor.author Diehl, R. D.
dc.date.accessioned 2011-03-07T20:34:52Z
dc.date.available 2011-03-07T20:34:52Z
dc.date.issued 2010-12
dc.identifier.citation Shin, H., et al. (2010). "Floating two-dimensional solid monolayer of C-60 on graphite." Physical Review B 82 (23): 235427-1 -- 235427-11. en_US
dc.identifier.uri http://hdl.handle.net/10385/808
dc.description.abstract Experiments on both single-crystal graphite and highly oriented pyrolytic graphite indicate that for 60 < T < 300 K, C-60 forms single-layer islands of close-packed molecules at low coverages. Low-energy electron-diffraction measurements on the single crystal indicate that there is almost no preferred orientation of the C-60 lattice relative to the graphite lattice, producing continuous diffraction rings. A slight preference for the C-60 lattice oriented at 30 degrees relative to the graphite lattice is explained as originating in the preference for the C-60 islands to nucleate and align at step edges, observed with scanning tunneling microscopy and low-energy electron microscopy. The energetics of this C-60 layer were investigated using the Novaco-McTague theory of epitaxial orientation, which found several minimum-energy angles near the experimental C-60-C-60 spacing, inconsistent with the experiment and suggesting an extremely small C-60-graphite corrugation. The thermal expansion of this "floating solid" C-60 lattice for 60 < T < 120 K was compared to theoretical models using previously formulated C-60-C-60 pair potentials. The calculated values, assuming perfect two-dimensional layers of spherical C-60, are significantly smaller than the measured values, suggesting that additional thermal excitations, such as those involving molecular orientations, are present in this temperature range. en_US
dc.publisher Physical Review B en_US
dc.title Floating two-dimensional solid monolayer of C60 on graphite en_US
dc.type Article en_US
dc.identifier.doi 10.1103/PhysRevB.82.235427

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