Temperature-dependent scanning tunneling spectroscopy of Cr(001): Orbital Kondo resonance versus surface state

T. Hänke, M. Bode, S. Krause, L. Berbil-Bautista, and R. Wiesendanger
Phys. Rev. B 72, 085453 – Published 25 August 2005

Abstract

The temperature-dependent surface electronic structure of Cr(001) is investigated by means of scanning tunneling spectroscopy (STS) in the temperature range between 22 and 350K. Consistent with earlier observations, a sharp peak is found in the tunneling spectra close to the Fermi level EF. While the binding energy remains unchanged, the peak broadens with increasing temperature. The experimental data are fitted within the framework of two physical models, i.e., in terms of a single-particle band theory and an orbital Kondo effect. Both models lead to a reasonable agreement between the fit and the experimental data. Using the Kondo model, a Kondo temperature TK of 123K is obtained. If interpreted in terms of a single-particle band theory, the fit results in an electron-phonon mass-enhancement factor λ, which is 5–10 times larger than the Cr bulk value.

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  • Received 14 April 2005

DOI:https://doi.org/10.1103/PhysRevB.72.085453

©2005 American Physical Society

Authors & Affiliations

T. Hänke, M. Bode*, S. Krause, L. Berbil-Bautista, and R. Wiesendanger

  • Institute of Applied Physics and Microstructure Research Center, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany

  • *Corresponding author. Electronic address: mbode@physnet.uni-hamburg.de; URL: http://www.nanoscience.de/bode

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Issue

Vol. 72, Iss. 8 — 15 August 2005

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