Regensburg 2010 – scientific programme
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.39: Poster
Friday, March 26, 2010, 11:00–14:00, Poster B1
Probing the long range signatures of single Kondo impurities — •Henning Prüser1, Martin Wenderoth1, Alexander Weismann1, Rainer G. Ulbrich1, Piet Dargel2, Robert Peters2, and Thomas Pruschke2 — 1IV. Physikalisches Institut, Georg-August Universität Göttingen — 2Institut für Theoretische Physik, Georg-August Universität Göttingen
Scanning tunnelling spectroscopy (STS) has provided an approach to study the Kondo effect - one of the oldest many particle phenomena known in condensed matter physics - in real space. In spite of the high spatial resolution of scanning tunnelling spectroscopy recent studies have shown that the hallmark of the Kondo effect is only visible if the tip is placed directly above the impurity [1]. We follow a new way and investigated single isolated Co and Fe atoms buried below a Cu(100) surface using low temperature STS [2]. For both impurity atoms we observe, in contrast to previous works a long range Kondo signature which is periodic with the distance to the impurity. The periodicity of the oscillations is given by the Friedel wave length of the surrounding copper crystal. Comparing the experimental results with many body calculations combined with a realistic band structure of copper we show that the observed long range signature can be attributed to the Kondo effect. This work was supported by DFG SFB 602 TPA3.
[1] M. Ternes et al., Journal of Physics: Cond. Mat. 053001 (2009)
[2] A. Weismann et al., Science 323, 1190 (2009)