Kondo cloud and spin-spin correlations around a partially screened magnetic impurity

László Borda, Markus Garst, Johann Kroha

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Abstract

We consider the spatial spin correlations around a partially screened spin-1 magnetic moment in a metal exhibiting the underscreened Kondo effect. We find that the underscreening of the impurity spin results in spatial spin correlations that are more pronounced as compared to the fully screened Kondo effect; their power-law decay is weaker but with characteristic logarithmic corrections at large distances. The spin correlator also changes sign as a function of distance to the impurity allowing for ferromagnetic correlations between conduction-electron spin density and the local moment. The numerical findings are shown to be in agreement with the predictions deriving from an effective ferromagnetic Kondo Hamiltonian.

Original languageEnglish
Article number100408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number10
DOIs
Publication statusPublished - Mar 3 2009

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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