Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 48: Oxide und Isolatoren II

O 48.9: Vortrag

Dienstag, 8. März 2005, 17:45–18:00, TU EB107

Field emission resonances investigated by scanning tunneling spectroscopy on Ag(001) surfaces and CoO islands on Ag(001) at low temperatures — •Stephan Großer, Christian Hagendorf, and Wolf Widdra — Martin-Luther-Universität Halle-Wittenberg, FB Physik, Hoher Weg 8, D-06120 Halle(Saale)

Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) have been applied to study the clean Ag(001) surface and CoO islands on Ag(001). CoO has been grown by reactive deposition of Co in an O₂ atmosphere. dI/dV and z(V) spectra in the range from 0 to 19 eV are used to investigate field emission resonances. In constant current mode the STS spectra on Ag(001) show up to 44 resonances.
The influence of the surface band structure, the tip radius and the tip structure on the field emission resonances have been examined. Qualitativ different spectra for the metallic Ag(001) surface and different structural phases of CoO islands have been obtained and will be discussed with respect to the different electronic band structures and work functions.