Recent high resolution photoemission studies of electronic structure in quasi-one-dimensional conductors

The electronic structure near the Fermi level of K0.3MoO3 and Li0.9Mo6O17, two prototypical quasi-one-dimensiona1 (1D) conductors, has been studied using very high resolution angle-resolved photoemission spectroscopy. Our results differ from earlier lower resolution studies. For Li0.9Mo6O17 we clearly observe a quasi-1D state dispersing through the Fermi level (E-F) and the opening up of a gap at as the sample is cooled through a bulk metal to non-metal transition at 24 K. For K0.3MoO3 we clearly observe two quasi-1D bands cross E-F, and measured a temperature dependence to the Fermi surface nesting vector that correlates well with neutron-scattering measurements of the charge density wave vector. (C) 2001 Elsevier Science B.V. All rights reserved.