Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Metal substrates: Adsorption of organic / bio molecules IV

O 37.6: Talk

Tuesday, March 23, 2010, 16:15–16:30, H36

Observing free-electron-like states in a Ferrocene layer — •Mircea V. Rastei, Benjamin W. Heinrich, Cristian Iacovita, Mauro Boero, Laurent Limot, and Jean-Pierre Bucher — Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Université de Strasbourg, France

We use low-temperature scanning tunneling microscopy and spectroscopy to study Ferrocene on Cu(111). Unlike the decomposition observed on Au(111), here the molecules are preserved upon adsorption and form ordered layers. Differential conductance spectra and maps reveal the existence of interface states of free-electron-like character in the HOMO-LUMO gap. Similar states were reported for other adlayers (NaCl, Xe, PTCDA), but this is the first interface state observed by STM at an organometallic layer. Additionally, we show that these states can be localized by depositing Cu atoms onto the Ferrocene layer, while for other metal atoms (Co, Au) a complex behavior is observed.