Abstract
The existence of a magnetic impurity in a metal is known to yield a resistance minimum in the dilute limit, whereas the anomalous resistivity in concentrated alloys x ∿ 5% is the subject of recent research. A historical review of resistivity and magnetic susceptibility experiments is presented culminating with the determination of a well defined impurity magnetic moment. The Kondo effect of a ℓnT divergence in the resistivity of dilute alloys is discussed. A new divergence of the form ρ ∿ x2/T arising from coupled magnetic impurities is obtained at low temperatures, and correlated with recent measurements on layered compounds. The latter term yields a resistance minimum for ferromagnetic alignment of the impurity spins. Changes in the RKKY interaction induced by the Fermi surface topology allow for antiferromagnetic alignment in some cases where the resistivity minimum is absent. The influence of the magnetic impurity pairs on superconductivity is also discussed.
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Ruvalds, J. (1983). Resistance Minima in Magnetic Alloys. In: Devreese, J.T., Brosens, F. (eds) Electron Correlations in Solids, Molecules, and Atoms. NATO Advanced Study Institutes Series, vol 81. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3497-2_7
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