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- Costi, T. A., et al.
(author)
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Kondo Decoherence : Finding the Right Spin Model for Iron Impurities in Gold and Silver
- 2009
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In: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 102:5, s. 056802-
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Journal article (peer-reviewed)abstract
- 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.
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