Applied Surface Science, Vol.254, No.1, 40-44, 2007
Electronic structure and anomalous photoemission line-shape of quasi-2D oxide eta-Mo4O11
The eta-Mo4O11 compound is a layered two-dimensional (2D) metallic system whose reduced dimensionality originates non-linear properties as charge density wave (CDW) instabilities. We report on synchrotron radiation angle resolved photoemission spectroscopy (ARPES) measurements in order to obtain a detailed picture of the electronic structure of this material. The symmetry of the states near the Fermi level (E-F) has been discussed in relation to the photoemission symmetry selections rules. Our results are in excellent agreement with previous tight-binding calculations and support the hidden nesting concept proposed to explain the CDW instabilities exhibited by this family of compounds. In addition, a very peculiar photoemission line-shape has been found with the presence of localized non-dispersive states. Some possible explanations are discussed. (C) 2007 Elsevier B.V. All rights reserved.
Keywords:photoelectron spectroscopies;charge density waves;electronic structure;low-dimensional solids