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O: Oberflächenphysik
O 28: Postersitzung (Elektronische Struktur, Grenzfläche fest-flüssig, Halbleiteroberflächen und -grenzflächen, Magnetismus und Symposium SYXM, Methodisches, Nanostrukturen, Oberflächenreaktionen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie)
O 28.7: Poster
Mittwoch, 10. März 2004, 16:00–19:00, Bereich C
Surface state as local sensor for single magnetic impurities — •Daniel Wegner, Andreas Bauer, and Günter Kaindl — Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin-Dahlem
The (0001)-surface of Lu metal exhibits a highly localized surface state directly at the Fermi energy, EF [1]. It appears as a sharp peak in the tunnelling spectra measured by low-temperature scanning tunnelling spectroscopy (STS) at 10 K. We have used this surface-state peak as a sensor for single magnetic impurities of Gd and Ho atoms embedded in the film surface. Within a radius of about 15 Å around such an impurity, the surface-state appears as a double-peaked structure in the tunnelling spectra with a narrow dip in between; this dip is only a few meV wide and is located within less than 1 meV at EF . The results are discussed on the basis of the Kondo effect.
This work was supported by the DFG, Sfb-290.
[1] A. Bauer, A. Mühlig, D. Wegner, and G. Kaindl, Phys. Rev. B 65, 75421 (2002).