Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 40: Elektronische Struktur V

O 40.3: Vortrag

Freitag, 28. März 2003, 11:45–12:00, M\"UL/ELCH

Influence of isolated oxygen adsorbates on the local electronic structure of 2 ML Fe/W(110) — •Kirsten von Bergmann, Matthias Bode, André Kubetzka, Oswald Pietzsch, and Roland Wiesendanger — University of Hamburg, Institute of Applied Physics, Jungiusstr. 11, D-20355 Hamburg

Recently the system of two monolayers Fe/W(110) has been studied intensely with spin-integrated and spin-polarised scanning tunneling microscopy (STM) and -spectroscopy (STS). These measurements together with calculations have led to a comprehensive understanding of the electronic as well as the magnetic properties of this system [1,2].

Here we report on the influence of chemisorbed isolated oxygen atoms. Spatially resolved STS shows strong modifications of the local density of states which are highly anisotropic and reflect the crystallographic symmetry of the substrate. Similar observations on Cr(001) have recently been interpreted in terms of an orbital Kondo resonance [3] i.e. a many-body effect. We will show that our results can be explained within a single-particle model.

[1] A. Kubetzka et al., Phys. Rev. Lett. 88, 057201 (2002).

[2] M. Bode et al., Phys. Rev. Lett. 89, 237205 (2002).

[3] O. Yu. Kolesnychenko et al., Nature 415, 507 (2002).