Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 49: Electronic structure IV

O 49.3: Vortrag

Freitag, 31. März 2006, 11:45–12:00, WIL B321

Surface electronic structure of Cr(001) — •Michael Budke¹, Tobias Allmers¹, Matthias Bode², Georgi Rangelov¹, and Markus Donath¹ — ¹Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Str. 10, D-48159 Münster — ²Institute of Applied Physics and Microstructure Research Center, Jungiusstr. 11, D-20355 Hamburg

There is an ongoing controversy whether a sharp peak close to the Fermi level E_F which appears in scanning tunneling spectroscopy (STS) measurements on the Cr(001) surface is related to a d_z²-like surface state [1] or to an orbital Kondo resonance [2]. A recent variable-temperature STS study was not able to bring about a decision which of the two interpretations is correct [3]. We have performed photoemission and inverse photoemission measurements on the Cr(001) surface to reveal the nature of the electronic states just below and above E_F. Surface- and bulk-like contributions are identified by their sensitivity to adsorbates. In agreement with previous STS data, we found a surface sensitive feature in our IPE measurements just above E_F. The results are dicussed in terms of their compatibility to the surface state and Kondo resonance model.

[1] J. A. Stroscio et al., Phys. Rev. Lett. 75, 2960 (1995).

[2] O. Y. Kolesnychenko et al., Nature 415, 507 (2002).

[3] T. Hänke et al., Phys. Rev. B 72, 085453 (2005).