ORIENTATIONAL DISORDER AND ELECTRONIC STATES IN C-60 AND A3C60, WHERE A IS AN ALKALI-METAL

Orientational disorder appears to persist in solid C60 even at low temperature, and similar static disorder is likely to exist in A3C60. The effects of such disorder on their electronic structures are studied by three-band tight-binding models for the C60 and A3C60 conduction bands. The densities of states for the disordered systems are quite different from those in the ordered systems. Participation-ratio analyses suggest that most of the states are delocalized, but there should nonetheless be a host of experimental consequences associated with short mean free paths.