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Kondo Decoherence: Finding the Right Spin Model for Iron Impurities in Gold and Silver
Institut für Festkörperforschung, Forschungszentrum Jülich.ORCID iD: 0000-0003-4341-5663
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2009 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 102, no 5, 056802- p.Article in journal (Refereed) Published
Abstract [en]

We exploit the decoherence of electrons due to magnetic impurities, studied via weak localization, to resolve a long-standing question concerning the classic Kondo systems of Fe impurities in the noble metals gold and silver: which Kondo-type model yields a realistic description of the relevant multiple bands, spin, and orbital degrees of freedom? Previous studies suggest a fully screened spin S Kondo model, but the value of S remained ambiguous. We perform density functional theory calculations that suggest S=3/2. We also compare previous and new measurements of both the resistivity and decoherence rate in quasi-one-dimensional wires to numerical renormalization group predictions for S=1/2, 1, and 3/2, finding excellent agreement forS=3/2.

Place, publisher, year, edition, pages
American Physical Society , 2009. Vol. 102, no 5, 056802- p.
Keyword [en]
Impurities, Precious metals, Silver, Spin dynamics, Statistical mechanics
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-62531DOI: 10.1103/PhysRevLett.102.056802ISI: 000263166400047OAI: diva2:480568
QC 20120207Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2012-02-07Bibliographically approved

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Bergqvist, Lars
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