Electron correlation and phase-dependent electronic structure ofC70

Abstract
Highly ordered thin films of C70 have been grown on GaAs(110). Temperature-dependent photoemission studies show changes in the valence-band electronic structure that are related to solid-state phase transitions at ∼280 and ∼340 K. The average on-site correlation energy for C70 is determined to be 1.0±0.2 eV, based on comparison of the C KVV Auger spectrum with a self-convolution of the valence band obtained from photoemission.