Surface state vs orbital Kondo resonance at Cr(001): Arguments for a surface state interpretation

M. Budke, T. Allmers, M. Donath, and M. Bode
Phys. Rev. B 77, 233409 – Published 26 June 2008

Abstract

We have performed a combined scanning tunneling spectroscopy, photoemission, and inverse photoemission study of the surface electronic structure of Cr(001). Our results show three surface-related features, one below, one above, and one right at the Fermi level EF. While the surface-sensitive features below and above the Fermi level show characteristics of dxz,yz orbital symmetry, the feature right at EF exhibits predominantly dz2-like orbital symmetry. Upon exposure to oxygen, its spectral weight continuously shifts into the unoccupied electronic states. These results are in conflict with the interpretation of this peak as orbital Kondo resonance but point toward a Shockley-type surface state.

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  • Received 24 March 2008

DOI:https://doi.org/10.1103/PhysRevB.77.233409

©2008 American Physical Society

Authors & Affiliations

M. Budke*, T. Allmers, and M. Donath

  • Physikalisches Institut, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Strasse 10, 48149 Münster, Germany

M. Bode

  • Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *Corresponding author: mbudke@uni-muenster.de

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Issue

Vol. 77, Iss. 23 — 15 June 2008

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