Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 51: Poster: Electronic Structure of Surfaces: Spectroscopy, Surface States
O 51.18: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster B
Comparative scanning tunneling spectroscopy study of cobalt oxide islands and thin films on Au(111) and Ir(100) — •Maximilian Ammon, Sara Baumann, Lutz Hammer, and M. Alexander Schneider — Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
Cobalt oxide is of great interest mainly due to its catalytic and magnetic properties [1-3]. It has been shown that cobalt oxide can be epitaxially grown on various single crystal surfaces of noble and transition metals [4-7].
Low-temperature scanning tunneling spectroscopy in ultra-high vacuum is used to study the electronic properties on a local scale. We compare cobalt oxide bi- and trilayer islands with a rocksalt structure on Au(111) [4,7] with corresponding cobalt oxide films on Ir(100). The measured local density of states (LDOS ∝ dI/dV) of the oxide is strongly reduced around EF on both substrates, but the spectral shape varies significantly. On Au(111) the dI/dV signal is reduced to zero in an energy interval of up to 0.5 eV around EF. In contrast on Ir(100) a sharp, symmetric dip is observed with finite dI/dV signal at EF.
[1] Fester et al., Nat. Commun. 8, 14169 (2017) [2] Liao et al., Nat. Nanotechnol. 9, 69 (2014) [3] Skumryev et al., Nature 423, 850 (2003) [4] Fester et al., Top. Catal. 60, 503 (2017) [5] Heinz et al., J. Phys.: Condens. Matter 25, 173001 (2013) [6] Schindler et al., Surf. Sci. 603, 2658 (2009) [7] Chassé et al., Surf. Sci. 602, 443 (2008)