Interplay between the Kondo effect and the Ruderman–Kittel–Kasuya–Yosida interaction

Henning Prüser, Piet E. Dargel, Mohammed Bouhassoune, Rainer G. Ulbrich, Thomas Pruschke, Samir Lounis and Martin Wenderoth ()
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Henning Prüser: 4. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1
Piet E. Dargel: Institut für Theoretische Physik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1
Mohammed Bouhassoune: Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA
Rainer G. Ulbrich: 4. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1
Thomas Pruschke: Institut für Theoretische Physik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1
Samir Lounis: Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA
Martin Wenderoth: 4. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract The interplay between the Ruderman–Kittel–Kasuya–Yosida interaction and the Kondo effect is expected to provide the driving force for the emergence of many phenomena in strongly correlated electron materials. Two magnetic impurities in a metal are the smallest possible system containing all these ingredients and define a bottom-up approach towards a long-term understanding of concentrated/dense systems. Here we report on the experimental and theoretical investigation of iron dimers buried below a Cu(100) surface by means of low-temperature scanning tunnelling spectroscopy combined with density functional theory and numerical renormalization group calculations. The Kondo effect, in particular the width of the Abrikosov–Suhl resonance, is strongly altered or even suppressed due to magnetic coupling between the impurities. It oscillates as a function of dimer separation revealing that it is related to indirect exchange interactions mediated by the conduction electrons.

Date: 2014
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DOI: 10.1038/ncomms6417

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