SURFACE ROTATIONAL DISORDERING IN CRYSTALLINEC60

D. Passerone and E. Tosatti
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D. Passerone: Istituto Nazionale per la Fisica della Materia (INFM) and Scuola Internazionale, Superiore di Studi Avanzati (SISSA) Via Beirut 2-4, I-34014 Trieste, Italy
E. Tosatti: Istituto Nazionale per la Fisica della Materia (INFM) and Scuola Internazionale, Superiore di Studi Avanzati (SISSA) Via Beirut 2-4, I-34014 Trieste, Italy;

Surface Review and Letters (SRL), 1997, vol. 04, issue 05, 859-861

Abstract: We present a theory of surface rotational disordering of crystalline fullerene. Realistic intermolecular interactions are implemented, in a layer-by-layer mean field theory. The crucial new ingredient turns out to be a one-body potential energy term, or "crystal field," is totally different at the surface, therefore locally frustrating bulk order. This frustration causes a severe surface order parameter reduction, and a first order surface rotational disordering transition, well below the corresponding bulk one. Preliminary results are in agreement with recent experiments, confirming a first order surface rotational transition ofC60(111)at a transition temperature lower than the bulk one.

Date: 1997
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DOI: 10.1142/S0218625X97000924

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