title: Orientational ordering in solid C60 fullerene-cubane.
abstract: We study the structure and phase behavior of fullerene-cubane C(60) x C(8)H(8) by Monte Carlo simulation. Using a simple potential model capturing the icosahedral and cubic symmetries of its molecular constituents, we reproduce the experimentally observed phase transition from a cubic to an orthorhombic crystal lattice and the accompanying rotational freezing of the C(60) molecules. We elaborate a scheme to identify the low-temperature orientations of individual molecules and to detect a pattern of orientational ordering similar to the arrangement of C(60) molecules in solid C(60). Our configuration of orientations supports a doubled periodicity along one of the crystal axes.
authors.affiliation: Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium. bart.verberck@ua.ac.be
authors.forename: Bart
authors.initials: B
authors.lastname: Verberck
authors.forename: Gerard A
authors.initials: GA
authors.lastname: Vliegenthart
authors.forename: Gerhard
authors.initials: G
authors.lastname: Gompper