On orientational relief of inter-molecular potential and the structure of domain walls in fullerite C60

Julia M. Khalack; Vadim M. Loktev

doi:10.1063/1.1542507

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On orientational relief of inter-molecular potential and the structure of domain walls in fullerite C60

Julia M. Khalack·Vadim M. Loktev

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Abstract

A simple planar model for an orientational ordering of threefold molecules on a triangular lattice modelling a close-packed (111) plane of fullerite is considered. The system has 3-sublattice ordered ground state which includes 3 different molecular orientations. There exist 6 kinds of orientational domains, which are related with a permutation or a mirror symmetry. Interdomain walls are found to be rather narrow. The model molecules have two-well orientational potential profiles, which are slightly effected by a presence of a straight domain wall. The reason is a stronger correlation between neighbour molecules in triangular lattice versus previously considered square lattice A considerable reduction (up to one order) of orientational interwell potential barrier is found in the core regions of essentially two-dimentional potential defects, such as a three-domain boundary or a kink in the domain wall. For ultimately uncorrelated nearest neighbours the height of the interwell barrier can be reduced even by a factor of 100.

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Julia M. Khalack, Vadim M. Loktev. 2003-02-04. On orientational relief of inter-molecular potential and the structure of domain walls in fullerite C60. https://doi.org/10.1063/1.1542507

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