Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Methods: Atomic and Electronic Structure I
O 34.8: Vortrag
Dienstag, 27. März 2007, 17:30–17:45, H42
The origin of the Te 4d core level splitting in transition metal dichalcogenides with distorted CdI2-structure — •Thorsten Zandt, Robert Heimburger, Christoph Janowitz, and Recardo Manzke — Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin
Typically quasi-two-dimensional transition metal dichalcogenides exhibit the charge density wave phenomena. These show up e.g. as a superstructure in electron diffraction (e.g. LEED) or Fermi surface nesting in angular resolved photoemission. In addition, an observed attending splitting of certain core levels has also been interpreted to be caused by the charge density wave.
In this contribution we present a detailed temperature dependent soft x-ray photoemission study of Te 4d core levels of transition metal ditellurides. In some materials with distorted CdI2-structure we found a splitting of the Te 4d core levels, but no superstructure in LEED. It will be argued the core level splitting, at least in the distorted ditellurides, is more likely due to the geometric zig-zag chains of the transition metals than a charge density wave effect.