Influence of Impurities on Localized Transition Metal Surface States: Scanning Tunneling Spectroscopy on V(001)

M. M. J. Bischoff; C. Konvicka; A. J. Quinn; M. Schmid; J. Redinger; R. Podloucky; P. Varga; H. van Kempen

doi:10.1103/PhysRevLett.86.2396

Influence of Impurities on Localized Transition Metal Surface States: Scanning Tunneling Spectroscopy on V(001)

M. M. J. Bischoff, C. Konvicka, A. J. Quinn, M. Schmid, J. Redinger, R. Podloucky, P. Varga, and H. van Kempen

Phys. Rev. Lett. 86, 2396 – Published 12 March 2001

Abstract

The first scanning tunneling spectroscopy measurements on V(001) are reported. A strong surface state is detected which is very sensitive to the presence of segregated carbon impurities. The surface state energy shifts from 0.03 eV below the Fermi level at clean areas towards higher energies (up to $\sim 0.2 eV$ ) at contaminated areas. Because of the negative dispersion of this state, the upward shift cannot be described in a simple confinement picture. Rather, the surface state energy is governed by vanadium surface $s$ - $d$ interactions which are altered by carbon coverage.

Received 14 January 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.2396

Authors & Affiliations

M. M. J. Bischoff¹, C. Konvicka², A. J. Quinn¹, M. Schmid², J. Redinger³, R. Podloucky⁴, P. Varga², and H. van Kempen^1,*

¹Research Institute for Materials, University of Nijmegen, 6525 ED Nijmegen, The Netherlands
²Institut für Allgemeine Physik, TU Wien, 1040 Wien, Austria
³Institut für Technische Elektrochemie and Center for Computational Materials Science, TU Wien, 1060 Wien, Austria
⁴Institut für Physikalische Chemie and Center for Computational Materials Science, Universität Wien, 1090 Wien, Austria